Quietly Melt Fat With This 21-Minute Full-Body Dorm Room Workout

• Make small jumps side-to-side as if you are jumping over an invisible line.
• Keep your legs as close together as possible, and swing your arms to help you jump.
• A jump to the left then the right completes one rep.
• Continue hopping (softly) for 30 seconds.

If you're worried this move might make too much noise, march in place instead. But definitely keep the movement vigorous.