Working your core muscles, i.e. your arms, chest, back, legs, and butt, will give you a total body workout. A great at-home core exercise is the sitting bridge. Sit tall with legs extended on the floor, feet flexed and palms down next to your hips. Next, contract your abs and glutes while lifting your hips toward the ceiling. Your body should form a straight line. Hold for five seconds and then return to start.