"Bodyweight exercises require more muscles to be used because you're not using a machine that guides the weight for you," said Alfonso Moretti, NSCA, founder and trainer at MERGE in Los Angeles. To start, he recommends mastering push-ups, pull-ups, body squats, lunges, and jumping jacks. "Try each exercise for 30 seconds for a five-round circuit," he said. And don't be afraid to start out with modified versions (i.e. doing push-ups on your knees) until you work up your strength to do the advanced forms.
Here are eight no-equipment workouts (cardio included!) to get started.