Headphones in, lone-wolf mode on—no handshakes, no hype squad—just iron, intent, and the discipline to show up when everyone else ghosts.

"When you challenge your arm muscles with resistance, you create microscopic tears in the muscle fibers," an expert told Newsweek.

Skip the burpees and crunches, I swapped to the mountain climbers exercise for a week to boost cardio fitness, core strength, and more ...

Don’t get stuck in the 8-12 rep range rut! Shake up your program and reignite your gains with the time-saving 5-5-5 workout ...