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Jumping jacks are great for cardio—but they can be tough to do in the middle of the work day or with a lower-body injury. This seated variation is just enough to spike your heart rate and burn calories without leaving you drenched in sweat.
How to do it: Sit tall with knees bent and together, feet pointed with toes lightly touching the floor, elbows bent and arms open to sides with palms facing forward. Quickly open legs out to sides, flexing feet, landing on heels, and extending arms overhead. Return to start. Do 30 quick reps in a row (the faster your tempo, the harder you'll work).
Don't be fooled: This workout firms and burns much more than you'd think!