"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." YOU'VE PROBABLY HEARD big guys at the gym tossing around the word "hypertrophy" when they talk about ...

Time under tension (TUT) is a weightlifting technique designed to build muscle mass by increasing the time muscles spend activated during an exercise. We cover if it works and what its benefits are.

This story is from Manual, GQ’s flagship newsletter offering useful advice on style, health, and more, four days a week. Sign up here to get it in your inbox. Whether you’ve been lifting for years or ...