Want to build muscle efficiently — without spending hours in the gym? Science-based bodybuilder Jeff Nippard reveals his ...

Overall, this method offers an efficient and effective way to build upper-body muscle. Try Nippard's 45-minute science-backed ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." For years, exercisers focused on getting in plenty of cardio. And, while cardio is still considered a ...