What It Is
Jumping your feet in and out while holding a plank. It raises your heart rate and challenges your trunk at once.
How to Do It
Start at the top of a push-up on the floor, hands under your shoulders and feet together. Jump your feet out wide, then jump them back together. Keep your hips at shoulder height the whole time.
Skill Level
Intermediate. Free-weight lifts, single-leg balance under load, or near-bodyweight strength moves. Form matters.
Type
Cardio. Raises your heart rate to build endurance and heart health.
Engagement
Bilateral. Each rep works both sides of the body at once.