Most runners think you can’t run big miles and keep muscle — and honestly, they’re half right. If you don’t fuel, lift, and train with a plan, your body will happily burn through muscle before it taps into fat. I learned this the hard way: I dropped from 76kg to 68kg in about two months because I was doing the “more running = more progress” thing while under-eating. This video is my scientific breakdown of why that happens, and the exact blueprint I used to rebuild strength without giving up long trail days. I walk through my 6 steps to protect muscle while training like a hybrid athlete: eat enough calories so you’re not in a constant deficit, hit protein targets that actually make sense for runners (not bro-science), and lift heavy in a way that supports running instead of trashing your legs. Then I zoom out to the bigger picture: periodize your training (base → build → peak → recover) so your nervous system doesn’t get cooked, fuel long runs so “fasted” doesn’t turn into “catabolic,” and take sleep + stress seriously because cortisol is a sneaky muscle killer. If you want to run far and stay strong, this is the playbook.