7 Fitness Tests Reveal How Fast You’re Actually Aging (Most People Fail At Least One, But It Predicts D*ath Risk 5x Better)

Mariana is almost 60 years old, effortlessly pulling herself up using just three fingers.

Meanwhile, her counterpart Melinda recently turned 61 and has never touched a weight in her life.

These two women represent opposite ends of an aging spectrum that fitness expert Will Tennyson recently explored through seven science-backed fitness tests—and what he discovered might completely change how you think about getting older.

Each test measured strength, power, mobility, and conditioning across different age groups, revealing exactly how lifestyle choices impact what bodies can actually do over time.

Power Loss Starts Earlier Than Most People Think

Muscle power—the ability to move explosively and react quickly—begins declining as early as your 30s.

Tennyson noticed this himself after years of soccer and sprinting gave way to bodybuilding-style training. “I switched to bodybuilding style training and I lost my explosiveness,” he explained.

Research shows power matters more than strength or size when determining how well bodies and brains hold up during aging. That’s why Tennyson’s first test measured explosive power through broad jumps.

The Broad Jump Reveals Your Explosive Capability

Jumping your own height passes baseline. For those 55 and older, half your height qualifies as passing.

Advanced requires clearing 2 meters for women or 2.5 meters for men. Failing to jump even half your height signals power needs serious attention.

Robin, 29, sits most days without exercising yet landed right at his own height—impressive considering natural muscle power begins declining around his age. Yash, also 29 but a regular lifter and volleyball player, easily cleared his height though fell short of advanced.

Melinda barely made the cut at 61. Mariana, nearly 60 but lifting weights four to five times weekly, jumped almost as far as younger men.

Type 2 Muscle Fibers Disappear With Age

Type 2 muscle fibers—fast-twitch fibers responsible for explosive movements—experience massive drops as people age.

Researchers examining muscle samples from people in their 20s through 80s found dramatic declines in these power-producing fibers. This explains why older participants started with fewer resources for explosive movement.

Training power requires moving weight quickly—whether through bodyweight jumping and sprinting or gym exercises like kettlebell swings. Unlike slow, controlled deadlifts, these train hips to produce force explosively.

Single-Leg Strength Exposes Hidden Weaknesses

Lower body strength and stability testing used reverse lunges—25% bodyweight in each hand, aiming for eight reps per leg.

Melinda failed within one rep. Robin lasted slightly longer using questionable form before failing after four reps. Both scored zero.

This test reveals critical information bilateral exercises like squats cannot. Both sides must pass independently, exposing strength imbalances between legs—surprisingly common even among experienced lifters.

Most people, they naturally favor one side. And with something like a squat, your stronger leg can quietly do more work and you’ll still finish the rep.

Research shows younger adults typically have 5-15% differences between sides. Older adults often reach 15-20% or more—making falls significantly more likely when one side cannot compensate during balance challenges.

Mariana and Yash, who regularly perform these exercises, passed baseline easily. Advanced testing required Bulgarian split squats—eight reps using 50% bodyweight in each hand for men, 30% for women.

Upper Body Pulling Strength Declines Dramatically

Can your upper body actually pull its own weight? This test measured lat, upper back, and bicep strength through chin-ups.

One bodyweight chin-up represents baseline. Advanced requires three or more reps with additional 40% bodyweight for men, or five clean bodyweight reps for women.

Robin couldn’t complete one rep. Yash passed baseline easily but fell just short of advanced. Melinda couldn’t manage a single rep—understandable given going from zero to one represents a massive strength jump.

Then Mariana demonstrated something remarkable. She completed five clean reps easily, placing herself firmly in advanced. Then she hung from three fingers.

I don’t even know if I can hang with three fingers.

Her secret? Rock climbing. She practices chin-ups and pull-ups minimum five times weekly to ensure climbing performance doesn’t suffer. Her DEXA scan revealed sub-17% body fat—top 1% population lean, equivalent to sub-10% for men.

Cardiovascular Fitness Trumps Diet For Longevity

Being out of shape carries risks comparable to diabetes, high blood pressure, and smoking.

A massive study examining over 120,000 patients performing treadmill testing found low fitness carried risk matching these serious conditions. Many researchers now suggest fitness matters more for health than diet.

Tennyson’s one-mile run test provided clear benchmarks:

• Baseline under 55: Complete in under 10 minutes
• Baseline over 55: Under 12 minutes
• Advanced under 55: Under 7 minutes
• Advanced over 55: 9 minutes or less

Yash, despite no formal cardio training, maintained solid base fitness from earlier years and finished at 7:16—just missing advanced. Mariana clocked 9 minutes flat, beating advanced for her age group.

Robin burned out early and finished at 12 minutes. Melinda struggled significantly with wheezing breathing throughout.

Cardio Destroys Dangerous Visceral Fat

Cardiovascular exercise proves most effective at burning visceral belly fat—dangerous fat deep within organs linked to disease and death.

Both Melinda and Robin showed alarmingly high levels on DEXA reports. Mariana’s visceral fat was virtually non-existent.

Her lifestyle revealed why: biking instead of driving, regular hiking, year-round activity. She prepared a full day of nutritious food—Greek yogurt with oats, smoked salmon bagel, plenty of protein and complex carbs.

Researchers call this high energy flux lifestyle—eating more while moving more. This combination represents one of the best long-term strategies for losing fat and maintaining results permanently.

Over 90% Fail This Shoulder Mobility Test

Upper body mobility testing required standing roughly one foot from a wall, resting glutes and upper back against it, then raising arms into goalpost position at 90 degrees.

Back of hands must touch the wall while keeping head against the wall without arching lower back. Advanced requires sliding arms all the way up while maintaining position.

Robin immediately failed despite thinking it looked easy. Strong lifters who do significant pressing often struggle—bigger muscles overpower key muscles like mid and lower traps that control proper shoulder movement.

Three additional gym-goers Tennyson tested all failed. Mariana and Melinda passed with flying colors.

The fix involves band or towel over-and-backs for three sets of 10-20 reps to open shoulders and chest, followed by wall slides to strengthen back muscles.

Core Strength Prevents Back Injury

Core muscles—all muscles around your waist, not just visible abs—keep you stable and strong during everything from catching falls to heavy lifting.

Weak cores cause lift performance to suffer, posture and balance to break down, and increase susceptibility to back injury—leading cause of disability worldwide affecting all ages.

Testing required 25 controlled roll-downs for baseline, 50 for advanced. Starting upright with hands forward, participants slowly lowered down flattening backs, then reversed by flexing spine into C-shape.

Melinda failed immediately. Robin struggled but continued. Mariana completed 50 with ease, prompting Tennyson to incorporate her exercises into his Built with Science app.

Free weight compound exercises train core significantly, but direct training helps—especially for those struggling with this test. Beginners should use rolldowns as both test and training, starting with partial reps and building to full controlled ones.

Sit-To-Stand Predicts Mortality Risk

2012 research involving 2,000 adults aged 51-80 administered a simple test: sit down and stand up.

Participants received five points for sitting, five for standing, losing points each time they used support like hands or knees. Researchers followed participants over 6 years—159 passed away during this period.

Those scoring poorly were five to six times more likely to die than high scorers.

Baseline simply required no support. Any support meant failure.

Robin passed despite not lifting. His daily 10-minute yoga routine explained superior mobility performance. Yash, significantly stronger, couldn’t pass—this test requires hip and leg mobility beyond just lower body strength.

Melinda needed one hand. Mariana passed effortlessly.

Improving requires 90-90 stretches to open hips, holding each side using arms for support, gradually progressing without hands and windshield wiping legs, then advancing to getups.

Final Scores Reveal Lifestyle Impact

Out of 14 possible points across all tests, results told compelling stories:

• Melinda: 3 points
• Robin: 3 points
• Yash: 5 points
• Mariana: 12 points

Mariana’s advice for staying in shape while aging? Start immediately. Find activities you enjoy. On difficult days, do something—stretching, yoga, anything. Just push yourself slightly.

Start as soon as you can. And anything just find anything you like. Those days that you don’t feel good, just do something. Stretching, yoga, something. Just push a little bit.

For Melinda and Robin, the message was clear: start strength training now. Age doesn’t matter—70, 80, 90—it’s never too late to begin building healthy habits that determine quality of life for decades ahead.

These seven tests provide actionable starting points. Identify weakest areas. Focus improvement there. Most importantly? Don’t overthink it—just begin moving toward becoming healthier, stronger versions of yourself at any age.