This fast-paced move pumps up your heart rate and strengthens your core at the same time.
Reps: 20, alternating sides each time
How to do it: Start on your hands and knees, with your abs braced in tight. Keeping your back naturally arched, lift your knees a few inches off the ground (without pushing your hips up in the air). Quickly step your right hand forward on the floor, slightly in front of your right shoulder, as you bend your left knee up towards your chest, lift your foot off the ground. Keep your abs tight and your hips below your shoulders the entire time. Step your foot back to the floor as you return your hand back to the starting position. Repeat on the other side. That's one rep. Continue alternating sides as quickly as you can for 20 reps total.
Form tip: If it's too challenging to do this move with your knees off the floor, try lightly resting them on the ground until you are able to do more.
60-second cardio burst: Do another set of jumping jacks (get creative with this set, you can make them scissor jacks, or travel your basic jack from side to side or forward and back) for 1 minute.