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Podcast Episode #62: Why You Don't Have to Max Out to Build Muscle

Going all-out on every rep isn’t the only way to get results. Jim Keen and Kyle Recchia break down the stimulus paradox—and why 80% effort can build just as much muscle over time. In other words, form trumps force.
Story By Kyle Recchia

May 29 — 2026

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FastFit Podcast Episode 62 Strength Training Weight Lifting

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An injury is an unacceptable result of exercise—because exercise is for health.

 

“You don’t have to stand in the fire to get warm. You could just be right next to it. An 80 or 90% effort on a FastFit machine—you’re getting most of the way there. There’s not much you’re missing over a long enough time.” — Jim Keen, Director of Training at FastFit

Jim Keen is back! And he’s tackling a misconception that’s been baked into isokinetic training since the beginning: that you have to go as hard as possible, every rep, every session, to get results.

The early logic made sense. The technology removed the limitations of weights, so why not maximize the mechanical tension every workout? Jim compares it to building a car that tops out at 150 mph. That’s the most efficient way from A to B—but it has drawbacks. If you’re experienced and your form is dialed in, maxing out works. But for most members, especially anyone over 40 with joint history or past injuries, that last 10–20% of effort carries outsized risk for diminishing returns.

Isokinetic exercise offers a reset to our approach to gaining muscle. This kind of strength training uses a tool to deliver stimulus to your muscles, whereas weightlifting uses your muscles to move a tool. When the goal becomes making a number go up on screen, form breaks down—and that’s where problems start. I share my own example. I chased peak numbers for months, gained 10 pounds of muscle in six months, but developed aches in my back and joints. Once I shifted to focusing on proper form and doing my best on any given workout, the aches went away. Now, several years later, I’m up 25 pounds of muscle total—and I’ve gained most of it without maxing out.

Also in this episode, Jim re-introduces the Ignite pathway. With Ignite, you set a baseline for a specific exercise, and our software shifts it to 87% for the next time. You job is to “stay in the tunnel.” If you spend 51% or more of your time in the tunnel, it shifts up 2% next session. Progressive overload—guaranteed—without maximal effort. Jim then tells the story of Bonnie—a woman in her 60s who showed up hating exercise, started at barely 10–15 pounds of force, and within three months was working as hard as any other client. The Ignite pathway gave her a way in.

In this episode, you’ll learn:

  • Why chasing peak numbers on the screen leads to form breakdown, joint stress, and chronic aches—especially for members over 40
  • The paradigm shift: use the tool to stimulate your muscles, not your muscles to impress the tool
  • Kyle’s personal results: 25 pounds of muscle over several years—most of it without maxing out
  • How the Ignite pathway works: baseline testing, the tunnel system, 2% progressive overload, and natural periodization
  • The story of Bonnie—how a woman who hated exercise became a full-intensity member in three months through submaximal starting points
  • Why “half of a sure thing is better than twice a nothing”—and why adherence matters more than intensity
  • Status update on Pathways: the software team flew in from Zurich to finalize the experience

🎧 Listen to the episode now:

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To speak with a Certified Personal Trainer about exercise, nutrition or any help with lifestyle adjustments please call us at (844) 403-1120.
By Kyle Recchia

Kyle Recchia is the CEO of FastFit®, a pioneering fitness and wellness company that has helped over 60,000 members achieve results through time-efficient strength training. A visionary leader and lifelong fitness advocate, Kyle is passionate about making exercise safe, effective, and accessible — delivering real results in just 20 minutes, twice a week. His mission is to revolutionize fitness and empower people to live stronger, healthier lives.

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