Natural Bodybuilders Swear by This Science-Backed Arm Workout for Explosive Growth originally appeared on Men's Fitness. If you want big arms that turn heads (and who doesn't?), Jeff Nippard’s science ...

We’re sure you know this by now (but in case you didn’t) running should be part of every runner's training routine; thanks to its ability to boost power, improve speed, and reduce the risk of injury.