Two Essential Habits for Sustaining Muscle Growth After 35

Women's Health made the same case from a different angle: the habits we build matter far more than the date on our birth certificate, especially once our fascia starts whispering that something underneath has shifted.

Why "peaking" is a misleading word

We hear "peak performance" and our nervous system tightens, the way a hip flexor does after an hour parked at a desk. The body remembers every stiff morning and quietly wonders if we've missed our window. But the experts Women's Health gathered — Natalie Ribble, CSCS, head coach at Seattle Strength and Performance, alongside registered dietitian Madison Shaw and sports medicine physician Dr. Mariam Zakhary — push back on the panic. Athletic peaks, Ribble explains, vary wildly depending on what we're actually asking the body to do. Explosive power tends to crest earliest, while endurance keeps climbing well into our late 30s and beyond.

The Swedish longitudinal study referenced in the piece found muscular endurance peaking around age 34 in women, aerobic capacity around 35, and jump power way back at 19. A 2015 systematic review of elite athletes showed the same general pattern: peak ages from roughly 20 to 27 for sprint and explosive events, stretching closer to 39 for ultra-distance cycling. Translation: if your sprint numbers feel softer in your late 30s, that's one fiber type settling down, not your whole athletic identity clocking out.

The two habits the founder is betting on

Business Insider's snippet only carries the headline — we don't have the founder's exact playbook — but the framing tracks closely with what the experts describe as the real levers still under our control. The first habit is training the kinetic chain, not the mirror muscles. Neural drive — that quiet conversation the nervous system holds with every muscle fiber — is one of the first things to slip as we age, Ribble notes, and pattern-based work keeps that conversation crisp. The second is feeding the tissue so it actually has something to work with. With type II fibers losing function and muscle mass drifting downward, protein timing, sleep, and recovery stop being accessories and become structural support for everything else we're trying to build.

A realistic way to fold this into your week

Here's where the rubber meets the fascia — and where most of us stall out. Pick one training day this week and swap a single burnout set for an eccentric-focused variation: three-second descents on a squat, a slow push-up, a controlled hinge. The lengthening phase is exactly where type II fibers do their most stubborn work. Pair it with a protein-forward meal within a couple of hours of training, then notice how your joints feel less compressed the next morning. We don't need to outrun our biology; we just need to out-habit it, one conscious rep at a time.