Go to a staircase and sprint or jog up it. Walk back down. Repeat for two minutes and mix it up—try skipping steps or hopping up the stairs.
PLANK/SIDE PLANK COMBO
Get into pushup position and then lower your forearms to the floor. Hold 15 seconds, and then rotate your body to your right, resting on your left forearm and stacking your feet so your whole body faces 90 degrees to the floor. Hold 15 seconds. Rotate back to the floor and hold 15 seconds. Rotate to your left and hold the side plank again. Keep your hips elevated the whole time.