Training is the stimulus. It is not the adaptation. That happens later — in the hours we treat as leftover time, and describe with words that all mean absence: rest day, off day, recovery day.
This week Pete brings Srdjan a piece of research that has nothing to do with the gym and everything to do with it. In 2007, Sabine Sonnentag and Charlotte Fritz published the Recovery Experience Questionnaire, built on a puzzle they kept running into: hours off didn’t predict who came back restored. Two people take the same weekend. One returns ready. One returns wrecked. Their answer was that recovery isn’t one thing — it’s four, and they don’t substitute for each other. Psychological detachment. Relaxation. Mastery. Control. If you spend all day being told what to do, lying on the couch won’t fix it; you need a rest that hands you back the controls.
Srdjan takes that framework into the gym and it holds up uncomfortably well. He walks through what’s actually happening in your body after a hard session — glycogen, protein synthesis, the twenty-four to forty-eight hour repair window — and makes the case that soreness is a lousy measurement of recovery, because different systems come back online at different speeds. Muscles, energy stores, connective tissue, nervous system. None of them are on the same clock.
Recovery isn’t separate from training. It is the training. Let’s build.
Links & Notes
- The Recovery Experience Questionnaire (Sonnentag & Fritz, 2007) — the four-factor model of detachment, relaxation, mastery, and control. Free full text, and the paper that kicked off this whole episode. Also on PubMed.
- Insufficient Sleep Undermines Dietary Efforts to Reduce Adiposity (Nedeltcheva et al., Annals of Internal Medicine, 2010) — the metabolic ward study, 8.5 versus 5.5 hours of sleep opportunity.
- Effect of 1 Week of Sleep Restriction on Testosterone Levels in Young Healthy Men (Leproult & Van Cauter, JAMA, 2011).
- The Effects of Sleep Extension on the Athletic Performance of Collegiate Basketball Players (Mah et al., Sleep, 2011) — every player improved on every measure.
- Gaining More From Doing Less? (PeerJ, 2024) — the thirty-nine-lifter deload study. Free full text.
- Work with Srdjan and the team at ELEV8 Fitness in Portland, Oregon.
- Submit your questions to the show!
What is Build for Health with Srdjan Injac?
Build for Health is a show that flips the script on fitness. Hosted by longtime podcaster Pete Wright and strength coach Srdjan Injac of ELEV8 Fitness, this show isn’t about gym culture or getting shredded—it’s about why building muscle is the most important investment you can make in your long-term health.
Each week, Pete and Srdjan break down the science, bust the myths, and offer real-world insight into how resistance training supports not just strength, but brain function, metabolic health, emotional well-being, immune resilience, and aging with independence.
If you think lifting weights is just for looks, think again. It’s time to rethink strength—and build a body that’s built for life.
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Meet the Hosts
Srdjan Injac is a certified strength coach and the founder of ELEV8 Fitness in Portland, Oregon. With a background in kinesiology and a lifelong passion for movement, he’s trained everyone from elite athletes to everyday professionals to feel strong, live pain-free, and age with purpose. Srdjan’s coaching style is built on evidence-based training, long-term sustainability, and a deep belief in the power of muscle as medicine.
Pete Wright is a veteran podcaster, storyteller, and—most importantly—a guy who used to avoid the gym at all costs. Srdjan’s just so happens to be his trainer. As such, Pete tries to bring curiosity, candor, and a deeply personal perspective on what it really takes to change your relationship with strength... no matter how much it hurts. With a background in health communication and habit-building for adults with ADHD, Pete asks the questions we’re all wondering—and helps listeners stay curious while getting stronger.