Perform the plank by holding yourself on your elbows and toes, keeping your body in a straight line. Pick up your right leg by squeezing your glute. Be sure to keep your leg straight and lift from your glute. Do not bend your knee. Your foot only needs to come off the ground a few inches. Place your foot back down and lift the other foot off the ground. Continue alternating feet until you have completed the desired number of reps or time.