Take your jumping jacks to the floor for this plank variation that not only works your arms, core, and lower body, it'll also get your heart pumping.
- Begin in plank position with your feet together. Keep your upper body stable and engage your abs.
- Begin doing jumping jacks with your legs. Hop them wide, then hop them together. Jump as quickly as you want.
- Do as many reps as you can for 30 seconds.