Why do you feel fine during a workout… only to wake up sore, stiff, or wrecked the next day?

In this episode of Past Your Prime, Craig and Alex break down a powerful clinical tool: the 3-Capacity Model, which helps you identify what’s actually limiting your progress—and what’s setting you up for injury, burnout, or flare-ups.

They cover:

• The difference between energy capacity, tissue capacity, and exercise capacity

• Why most people train the wrong one (and don’t realize it)

• How to use the 6-level response scale for fatigue and pain

• Why workouts that feel good can still backfire

• Case studies: a breast cancer survivor, a college runner, and a retired firefighter trying to get back on track

  
  

If you’ve ever said, “I don’t get why I’m sore—I didn’t even push that hard,” this episode will change how you think about fatigue, injury, and sustainable performance.

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Welcome to Past Your Prime – the podcast for active adults balancing training, rehab, family, and real life.

In each episode, hosts Craig Smith and Alex Keicher dive into real-world strategies for overcoming injuries, staying strong, and living pain-free — even when life gets chaotic.

💡 Learn more, access resources, and join our community: 👉 pastyourprime.com

Follow us on Instagram:

📲 Alex – @spikerkeicher

📲 Craig – @craigsmithPT