Marcus Kellerman

Strength & Recovery Writer

I'm a lifelong fitness enthusiast who spent my 30s and 40s obsessively testing everything—from protein timing to recovery protocols to whether creatine actually works. What started as personal curiosity became a passion for breaking down the science of muscle adaptation in plain language. I've trained across three decades, watched my body change dramatically, and learned that the principles that worked at 25 don't always work at 48. My goal is helping readers cut through noise and understand the real mechanics of muscle growth, whether they're beginners, returning athletes, or older adults rediscovering strength. I also keep a detailed training log and love experimenting with periodization.