Combining multiple muscle groups into a single workout can help you make serious progress with your fat loss goals as well as increase your lean muscle. This workout takes that idea to a whole new level. This Thighs & Tris workout from PopSugar Fitness is a combo I had never seen put together before, but after doing the workout… I get it! It uses multiple moves for each muscle group to keep you constantly working without ever tiring out one muscle too much. “Good idea” is an understatement!