I f you thought endlessly curling dumbbells was the only way to get jacked arms and build your upper body, think again. Yes, it may be one of the best ways, but it's not the only way. Calisthenics ...

Calisthenics might be the word your grandfather ... then go back to the starting position. Use your upper body. Don't kick your feet. You'll be working all of your back muscles and forearms.

In fact, you can use this 20-minute calisthenics workout to build full-body strength and improve overall fitness without equipment. Think again if you don’t believe 20 minutes can torch your ...

You only need a rucksack and this 30-minute workout to boost full-body strength and fitness ...