The supine alternate toe tap exercise is designed to strengthen and improve the recruitment of your lower abdominal muscles, which provide support for your low back.
Begin lying on a mat with your knees bent and feet flat on the floor. You may place your fingers on your lower abdominal muscles just inside your hip bones so you can feel when they are contracting. Lift both knees up toward the ceiling in preparation for the exercise.
Slowly lower one foot down toward the floor and touch your toes on the floor. Bring your foot back up. Slowly lower the other foot down toward the floor and touch your toes on the floor. Bring your foot back up. Continue alternating sides.