Science Of Fitness Podcast Q&A - With Host Kieran Maguire

Ten questions sumited by our members and listeners. 

No fluff, just the fitness stuff people argue about every day, explained with a mix of research, coaching reality, and the lessons we’ve picked up after years of training clients and interviewing sharp minds on the Science of Fitness Podcast.

We dig into protein first because it’s the simplest lever with the biggest payoff, then get brutally clear on what matters most: your daily total, not some perfect timing rule. From there we cover creatine for men and women, why the scales often go up when you start, and how to think about supplement quality. We also talk GLP‑1 medications like Ozempic and Mounjaro, the real risk of losing lean muscle mass during fast weight loss, and the two non negotiables that protect you: strength training and enough protein (with smart, realistic planning when appetite is low).

Performance gets its own spotlight too. We share what to eat in the week before a Hyrox or running race, why carbohydrate loading is a multi day job, and why hydration has to match the carb bump. Then we rank supplements that are actually worth your money (creatine, omega 3, vitamin D, caffeine strategy, magnesium context) and call out the marketing tactics that keep people stuck buying “solutions”.

We finish with the bigger questions: whether women should train differently across cycle and life stages, how VO2 max relates to longevity, why wearables are better for long term trends than daily permission slips, and what beginners should tackle first before jumping into Hyrox or CrossFit. The final punchline is the biggest lie in the fitness industry: the promise of one perfect protocol.

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