Sports Physio Reveals the Minimum Effective Dose for Flexibility: 7 Minutes a Week Per Position (But Intensity Matters More)

Lifting weights doesn’t have to make you stiff and inflexible.

In a recent conversation, movement expert and flexibility coach Tom Merrick challenged one of fitness’s most persistent myths.

The truth is far more nuanced than most people realize.

Your training intention matters more than the weights you lift.

The Real Reason Lifters Get Tight

Merrick explains that weight training’s effect on flexibility depends entirely on how you approach it.

I think that it’s a common misconception, but mostly because people lift weights in a way that doesn’t move them for a full range of motion is essentially like ultimately what you get out of your training matters around the intention that you put into it.

Loading maximum weights forces biomechanical compromises. Powerlifters rarely perform full “ass to grass” squats because reducing range of motion allows heavier loads.

Olympic weightlifters tell a different story. They combine maximum loads with complete ranges of motion, developing both strength and flexibility simultaneously.

Compound Lifts Can Build Flexibility

Can squats and deadlifts improve your mobility? Merrick believes they can, with important caveats.

I think so. I think it depends on the individual though. Uh, I mean, yeah, if you’re someone that would take a squat again, for example, if you’ve got super tight ankles, I don’t know if just squatting is a good enough stimulus to see like improvements at the ankles.

Flexibility behaves like water, flowing through paths of least resistance. Tight ankles might remain restricted while hips compensate during squats.

Bodies solve movement problems through whatever pathway proves easiest, not necessarily the one that needs improvement most.

The Ego Problem in Range of Motion Training

Most gym-goers prioritize weight over form. This attachment to heavy loads actively prevents flexibility gains.

Merrick identifies humility as essential for mobility development.

I think it’s the ego attachment to lifting where we look at the average person and they want to lift the most amount of weight and just push it. Often sloppy form.

Progressive overload becomes counterproductive when range of motion matters. Heavier weights trigger protective nervous system responses that limit flexibility.

Pec flies demonstrate this principle perfectly. Using 10-15 kilos with bent arms satisfies ego but provides minimal stretch benefit.

The Sweet Spot for Chest Flexibility

Merrick recommends a dramatically different approach for mobility-focused chest work.

But if you grab like three to five kilos or something, I think uh Pican used to mention like if you can do more than 10% of your 1RM bench in flies, you’re like you’re just you’re ego lifting as opposed to like actually performing that uh chest abduction fully.

Light dumbbells on a slight incline allow gravity to pull the chest open fully. This creates one of the most effective chest stretches available.

Balancing Strength and Flexibility in Your Program

Social media showcases extremes: ultra-light stretching advocates versus heavy strength purists.

Reality requires integration, not choosing sides.

Merrick suggests thinking beyond individual exercises to entire training sessions.

I think probably the mistake that people make is rather than thinking from like a training practice or a session, they think about like one exercise.

Front-foot elevated split squats exemplify this trap. They’re neither the best strength builder nor the optimal flexibility developer.

Standard squats with heavy loads build more strength. Long lunge holds provide superior hip flexor stretching with 60 seconds under tension versus 10-20 seconds accumulated during reps.

The Session-Wide Strategy

Smart programming separates objectives within workouts:

• Primary lifts: Focus on progressive overload with good (not perfect) range of motion
• Accessory work: Reduce loads significantly and maximize range of motion
• Dedicated flexibility: Target specific restrictions with appropriate stretching protocols

This approach delivers maximum stimulus for both strength and flexibility without compromising either.

Isolate Components for Complex Positions

Attempting splits by only practicing splits creates bottlenecks. One tight area restricts the entire kinetic chain.

Merrick advocates targeted isolation for faster progress.

If we take the like said principle as just as face value, you know, you get specific adaptation to impose demand, you get better at the things you do. If you want bridge, do bridge. It kind of does make sense, but as you said and kind of as I said earlier about the flexibility is like water in terms of it takes the path of least resistance.

Back bridge work benefits more from separate thoracic mobility drills and lat pullovers than additional bridge repetitions.

Front splits improve faster when addressing hip flexors and hamstrings independently before combining them.

Genetic Limitations Aren’t Destiny

Some people naturally bend like gymnasts. Others feel stiff from childhood.

Merrick identifies himself firmly in the latter category.

As someone who was not very flexible, then I would say that it’s a bit of a myth. I do think that we’re all genetically predisposed to be better at one another.

Naturally flexible individuals respond to minimal stretching stimulus. Inherently tight people require significantly more intensity and consistency.

Loaded stretching methods prove particularly effective for those with high internal resistance to range of motion increases.

Active Methods Beat Passive for Stiff People

Men and naturally inflexible individuals benefit most from strength-based flexibility approaches.

Contract-relax techniques and loaded positions coax nervous systems into accepting new ranges more effectively than passive static holds.

Static stretching produces transient improvements at best for this population. Active flexibility builds lasting adaptation.

Understanding Flexibility Categories

Terminology confusion prevents many people from optimizing their mobility work.

Merrick prefers flexibility as an umbrella term encompassing several subcategories:

• Dynamic flexibility: Movement through ranges with momentum or weight
• Active flexibility: Using opposing muscle groups to hold positions (standing leg lifts)
• Passive flexibility: Maximum range with minimal load assistance
• Static flexibility: Holding loaded positions without movement (middle splits hold)

Each serves distinct purposes in comprehensive flexibility development.

Minimum Effective Dose for Static Stretching

How long must you hold uncomfortable positions?

I think the minimum effective dose that I’m aware of is like I think it’s five minutes per week per position. So five to seven minutes per week.

Seven minutes weekly equals one minute daily—appealingly simple.

Frequency amplifies results beyond single extended sessions. This applies per stretch, not total stretching time.

Intensity Matters More Than Duration

Sixty-second holds require 7-8 out of 10 intensity on the discomfort scale.

Ease into position gradually, reaching peak intensity around the 30-second mark. Continue pushing deeper rather than passively maintaining position.

Progressive overload applies to stretching identically to strength training. Each session should show measurable depth increases.

Timeline Expectations

Thirty-day transformation promises set unrealistic expectations.

Genuine flexibility development measures in months to years. Understanding this timeline prevents discouragement.

Social media shows end results without revealing the process. That effortlessly flexible gym member invested significant invisible work.

Initial progress feels glacially slow, especially for naturally tight individuals who paradoxically benefit most from improved mobility.

Maintenance Requires Far Less Work

Encouragingly, maintaining flexibility demands approximately one-sixth the effort required to build it.

Like it does suck and there is going to be a significant amount of work, especially if you are on that tighter end of the spectrum. And often it’s kind of a bit it’s a bit catchway too because the people who are like really restricted are the people who probably would feel the most benefit from getting more flexible.

Twelve weekly sets shrink to two for maintenance. Years of dedicated work create lasting adaptation requiring minimal upkeep.

Periodize Flexibility Goals

Attempting simultaneous progress across multiple domains guarantees plateau everywhere.

Merrick experienced this firsthand during 2020, pursuing splits, bridges, upper body strength, and lower body strength concurrently with zero progress in anything.

Accept strategic sacrifice. Select 1-2 flexibility objectives, progress them intensely, then maintain while shifting focus elsewhere.

This “Pokémon approach” eventually acquires all desired skills without chronic spinning wheels.

Front Foot Elevated Split Squats: The Jack of All Trades

Merrick harbors particular skepticism toward exercises marketed as solving multiple problems simultaneously.

I don’t think it’s a particularly fantastic exercise from a strength or a flexibility example. I think it’s good at doing both. But if we take it from strength perspective, it’s like, okay, is there a better option for getting stronger like quads and that kind of pushing? Yeah, you could squat.

One-stop solutions rarely deliver optimal stimulus for any specific adaptation. Separate strength work from flexibility training for maximum effectiveness.

Stretching and Injury Risk

Old wisdom suggested pre-workout static stretching decreased performance and increased injury risk.

Current evidence shows minimal impact outside specific contexts. Intense hamstring stretching immediately before sprinting proves problematic. Stretching hip flexors before handstands causes no issues.

Non-competing muscle groups allow intelligent pairing. Rest between handstand sets in middle split holds combines goals efficiently.

Movement Perfectionism Causes Problems

Universal “correct” movement patterns ignore individual biomechanics.

Dramatically different levers produce dramatically different optimal positions.

I certainly if you’re like coaching someone where form is kind of important maybe from an aesthetic point of view. So, if you’re training handstands, I know people want to go after like a super straight line and have super flexible shoulders, but actually in the early days, that could be uh something that limits you because you’re focusing too much on that aesthetic.

Perfect technique with inadequate effort delivers less than imperfect technique with maximum intensity.

Bodies naturally solve movement problems based on individual strengths, weaknesses, and structural variations. Forcing “correct” patterns onto biomechanically unsuited individuals increases injury risk.

Pain-Free Trumps Perfect

The single most important technical consideration: Can you perform the movement without joint or tendon pain?

Pain-free “imperfect” technique beats painful “perfect” form every time.

Load management matters more than technical precision for injury prevention. Excessive volume with flawless form still breaks bodies.

Age and Training Intensity

Thirty-year-olds lament lost youth. Forty-year-olds tell them to wait. The cycle continues infinitely.

Biological changes occur, but accumulated training age creates unique risks. Decade-plus experience builds significant strength capable of spectacular self-destruction.

Returning after layoffs proves particularly dangerous. Mental capacity remembers capabilities bodies no longer possess.

Sprinting exemplifies this phenomenon perfectly. Childhood running develops tendon conditioning taken for granted, lost through years of static gym training, then catastrophically rediscovered via hamstring tears.

Daily Stretching Isn’t Mandatory

Many avoid flexibility training entirely believing daily commitment represents the only effective approach.

Merrick built his flexibility through nightly routines but acknowledges this suits his preferences, not universal requirements.

Do you need to do it to get flexible? Definitely not.

One to two intense weekly sessions produce excellent results. Daily practice works. Infrequent focused work works.

Personal preference determines optimal frequency. Sustainability matters infinitely more than theoretical optimization.

Static Stretching Builds Foundation

Relaxation represents an undervalued skill.

High neural tension and sensitive stretch reflexes make stretching genuinely unpleasant for many people.

Initial flexibility gains come predominantly from increased discomfort tolerance rather than tissue length changes. The first 4-8 weeks raise pain thresholds without structural adaptation.

Static stretching teaches nervous systems that end-range positions don’t threaten survival. This psychological component enables productive intense work later.

The Middle Split Paradox

No muscle connects legs to each other. Zero anatomical structure prevents legs sliding outward.

Nervous system protection creates the only barrier. Convincing that protective mechanism to relax accelerates all subsequent training.

Anatomical Limitations on Side Splits

Not everyone can achieve floor-flat middle splits regardless of training quality or duration.

Hip socket anatomy varies dramatically between individuals. Femoral retroversion and other structural factors create hard limits.

Merrick reached his middle split in approximately one year but notes his final position involves significant pelvic posterior tilt rather than purely lateral leg abduction.

I think almost for most people a middle will look like a really really wide pancake.

Functional range exceeds aesthetic perfection in importance. Being 10 centimeters from the floor without hip discomfort provides all practical benefits.

Expect Soreness from Intense Stretching

Loaded flexibility training produces delayed onset muscle soreness identical to strength work.

Hamstrings generate particularly severe DOMS due to fast-twitch fiber composition. Half the week post-training shows reduced flexibility while tissues recover.

Progress trends upward over weeks despite temporary backwards steps. Four to five days minimum before accessing similar ranges again.

Stretching doesn’t alleviate soreness—it causes it when performed intensely.

The Intensity Sweet Spot

Too little effort yields minimal adaptation. Excessive intensity triggers overwhelming protective responses.

Inability to breathe during stretches signals excessive threat perception. Survival priorities override flexibility development.

Target manageable discomfort where conscious control remains possible. Autoregulate based on sensation rather than mirror feedback.

Morning stiffness, illness, fatigue, and temperature affect available range. Forcing yesterday’s depth today risks injury.

Bulletproofing Exercises and Longevity Training

Training for longevity shouldn’t mean avoiding intensity entirely.

Front-foot elevated split squats and similar “bulletproofing” movements often serve as excuses for reduced effort rather than genuine injury prevention.

I’ve seen a lot of people rightly so mentioning that like people training for longevity is kind of just like an excuse not to train hard in the gym.

Reduced loads and modified ranges help during specific circumstances. Building them into permanent programming without high-intensity work creates gradual decline rather than maintained capacity.

Decades of high-level performance remain possible into the 40s, 50s, and beyond. Longevity work should support maximum performance, not replace it.

Exercise Variety for Flexibility

Twelve different hamstring stretches provide less benefit than mastering two.

Repetition builds understanding. Conversations with your body about specific positions deepen through consistency.

Measurable progress in tracked movements creates motivation. Rotating constantly prevents both.

Change variations when leverage advantages diminish. Standing pancakes provide superior gravity assistance compared to seated versions once baseline flexibility exists.

Select exercises maximizing mechanical advantage for current flexibility levels, not arbitrary variety.

Posture and Pain

Perfect posture doesn’t prevent pain. Poor posture doesn’t guarantee it.

Emerging evidence increasingly disconnects postural alignment from injury risk and discomfort.

Aesthetic considerations remain valid. Standing tall with shoulders back looks better regardless of pain correlation.

Sixty seconds of stretching can’t overcome eight hours of desk positioning. Habit strength overwhelms brief interventions.

Your next posture is your best posture. Avoid extended periods in any single position.

Asymmetries Are Normal

Humans aren’t symmetrical machines.

One arm throws farther. One hand writes legibly. These differences extend throughout bodies.

Address only dramatic discrepancies affecting compound lift performance. Marginal differences require no intervention.

Unilateral training prevents bilateral work from masking and exacerbating imbalances.

For flexibility, halve volume on the flexible side or double volume on the restricted side temporarily. Return to balanced programming once asymmetry normalizes.

Structural factors like scoliosis or leg length differences create permanent asymmetries requiring acceptance rather than correction.

Weight training and flexibility work together beautifully when programmed intelligently. Intention determines outcomes more than exercise selection.

Drop your ego, embrace extended ranges, and watch both strength and mobility flourish simultaneously.