High Knees

HIGH KNEES take the alternate-foot step and drive each knee up toward hip height on every jump — a high-intensity move that spikes your heart rate and builds explosive single-leg power and core control. The rope passes once per foot, as in the alternate-foot step, but now each lift is bigger and more athletic.

FilmableFilm this on your phone and TrueForm measures your body mechanics and tells you what to fix. You get angles, not a made-up score.