When you're working out at home [1], it's important to mix things up so your routine doesn't grow stale — but if you're short on equipment [2], it can feel challenging to do that. Fortunately, YouTube is chock-full of bodyweight workouts that will help you burn calories and build muscle [3] with no equipment at all. In many cases, you can squeeze in these workouts even when you're pressed for time, and the variety will keep your sessions fresh and interesting. To help get you started, we've rounded up 15 workouts you can do in just 30 minutes. Keep reading for our picks!