Fitness enthusiast and content creator Will Tennyson recently embarked on an unconventional experiment that stripped training down to its rawest form.
For an entire month, he replaced all traditional gym equipment with sandbags—a brutally simple, surprisingly challenging approach to building strength.
The results? Unexpected muscle development, therapeutic benefits for old injuries, and a humbling reminder that unstable, unpredictable resistance creates stimulus that traditional weights simply can’t replicate.
In a recent YouTube video documenting his journey, Tennyson discovered that what started as a $20 experiment at the hardware store transformed into one of his most effective training blocks in recent memory.
Jump to:
- The $20 Gym: Getting Started With Sandbag Training
- Why Sandbag Training Feels Harder Than Traditional Weights
- Building a Structured Sandbag Program
- The Unexpected Therapeutic Effect
- Physical Transformation: The One-Month Results
- Why More People Don’t Train With Sandbags
- Practical Takeaways for Incorporating Sandbag Work
The $20 Gym: Getting Started With Sandbag Training
Tennyson’s journey began at a hardware store with four bags of generic all-purpose sand, totaling approximately $20. Each bag weighed around 40 pounds—lighter than expected, but the unstable nature of sand quickly proved deceptive.
It’s extremely humbling. I’m so much weaker than I thought. Like, we got work to do. Like, work.
After just 20 minutes of his first experimental full-body session, Tennyson was completely exhausted. Two bags totaling 80 pounds felt significantly heavier than equivalent traditional weights due to the constantly shifting center of gravity.
But the primal simplicity came with immediate complications.
The Leak Problem
Within minutes of his first workout, bags started leaking sand through small tears. Duct tape provided temporary fixes, but holes multiplied faster than repairs could keep up.
Oh, man. Knew this was going to happen. I just didn’t think it was going to happen this quick.
The solution required a return trip to the hardware store and an upgrade to heavy-duty contractor trash bags wrapped in grippy potato sack material for that authentic, earthy feel.
Why Sandbag Training Feels Harder Than Traditional Weights
The defining characteristic of sandbag training is instability. Unlike dumbbells or barbells with fixed weight distribution, sand constantly shifts during movement.
This creates what Tennyson described as “weird strength”—the ability to stabilize, balance, and control weight through unpredictable planes of motion.
- Increased stabilizer muscle activation: Constantly adjusting to shifting weight recruits smaller supporting muscles
- Enhanced grip strength: Awkward bag shapes demand stronger, more varied gripping patterns
- Functional movement patterns: Sandbags force natural, multi-planar movements rather than isolated exercises
- Greater metabolic demand: Stabilizing unstable loads burns more energy than controlled movements
Tennyson noticed severe leg soreness after his first session, nearly face-planting while climbing stairs to retrieve camera equipment.
The Commercial Upgrade
After weeks of battling shedding jute fibers from potato sacks, Tennyson invested in purpose-built sandbag equipment. He tested three options: a 100-pound capacity Amazon bag, a 60-pound GoRuck sandbag, and a 200-pound capacity Rogue sandbag.
The commercial bags offered different shapes—oblong versus circular—which changed how exercises felt and which muscles were emphasized.
Building a Structured Sandbag Program
After experimental first weeks, Tennyson developed a three-day split focused on different training goals.
Upper Body Day
- 10 sets of 10 push-ups with 40-pound sandbag on back
- Bicep curls with single sandbag (two hands, then single-arm hammer curl style)
- Single-arm overhead presses
Tennyson found single-arm hammer curls with a 40-pound sandbag felt substantially harder than equivalent dumbbell work, likely due to grip challenges and unstable resistance.
Lower Body Day
- Walking lunges carrying sandbags
- Front-loaded squats (attempting to balance bags in front squat position)
- Overhead presses (integrated with leg drive)
Even just trying to hold these bags was fatiguing.
Simply maintaining position with sandbags created significant muscular demand before movement even began.
“Weird Strength” Day
This unconventional session focused on movements impossible or prohibited in traditional gyms:
- Sandbag throws overhead
- Ground-to-shoulder pickups and carries
- Strongman-style bag tosses
- Unpredictable, multi-planar movements
These explosive, full-body movements developed power and coordination in ways standard lifting cannot replicate.
The Unexpected Therapeutic Effect
Perhaps the most significant discovery was sandbag training’s impact on Tennyson’s chronic lower back issues. He entered the experiment worried about re-injury after previous back problems.
Instead, he experienced zero lower back pain throughout the month.
The sandbag workouts felt therapeutic on my lower back. And over the course of these 4 weeks, it felt like my lower back was becoming stronger, stronger than it had been in a long time.
The gradual progression from 40-pound bags to 100-pound commercial equipment apparently provided ideal loading to strengthen supporting musculature without excessive strain.
Similarly, single-arm overhead pressing helped rehabilitate his right shoulder injury, which had left him noticeably weaker on that side.
Physical Transformation: The One-Month Results
Comparing before and after photos revealed subtle but meaningful changes, particularly in posterior chain development.
While front-facing images showed minimal difference aside from increased tan, back views told a different story.
Tennyson observed noticeable development in:
- Upper traps: More defined musculature across upper back
- Lower back thickness: Visible hypertrophy in erector spinae and surrounding stabilizers
- Overall back density: More muscular appearance when flexing
These results make sense given the constant stabilization demands and heavy loading patterns inherent to sandbag training.
Why More People Don’t Train With Sandbags
Despite effectiveness and minimal cost, sandbag training remains uncommon. Several factors explain this:
Inconvenience and mess. As Tennyson discovered, DIY sandbags leak, shed fibers, and require maintenance. Commercial options solve this but increase cost.
Lack of familiar structure. Traditional gym equipment comes with established exercises and progression schemes. Sandbags require creativity and experimentation.
Ego challenges. Using significantly lighter weights than barbell equivalents can feel discouraging, even though difficulty is equal or greater.
Limited tracking precision. Sand shifts and settles, making exact weight measurements difficult compared to calibrated plates.
Practical Takeaways for Incorporating Sandbag Work
You don’t need to replace all training with sandbags to gain benefits. Consider these integration strategies:
- Start lighter than expected: 40-pound sandbags feel like 60+ pounds due to instability
- Invest in quality bags initially: Purpose-built sandbag equipment eliminates leaking and shedding frustrations
- Use for accessory work: Add sandbag carries, throws, or loaded carries after primary lifting
- Program one “weird strength” session weekly: Dedicated unconventional movement training prevents staleness
- Focus on rehabilitation: Gradual sandbag loading may help strengthen injury-prone areas
Tennyson plans to continue sandbag training specifically for back health and functional strength development alongside traditional lifting.
His experiment demonstrates that sometimes the simplest, most primal training tools deliver results that sophisticated equipment cannot—if you’re willing to embrace discomfort, unpredictability, and genuine physical challenge.
