Start on your hands and knees with your shoulders directly over wrists and your hips over your knees. Step your feet back to come into a high plank position, pulling your core tight against your spine and keeping your back flat so your body is in one straight line. This is your starting position.
Step your right foot forward and set it down just outside of your right hand. If you can't step all the way there, use your hand to guide your foot forward and place it down.
With your left leg extended behind you, rotate your chest to the right and extend your right arm overhead. Brace your core and twist from the waist, making sure your hips stay as stationary as possible (not twisting with your torso) and your abs are engaged.
Set your right arm back down, directly below your shoulder, and step your right foot behind you to return to the starting position.
This counts as one rep. Complete three sets of 12 reps, alternating sides. Rest for 30 to 45 seconds between sets.