Start on your hands and knees, with your hands under your shoulders, and knees under your hips.
Tighten the abdominal core muscles.
Flex the opposite leg and opposite arm simultaneously, to have your knee and elbow meet.
Then extend the leg and the arm simultaneously, making sure you maintain good control in your torso.
Do not allow your body or hips to rotate.
Repeat on the same side for the designated number of repetitions.
