Always remember to exercise your better side first.
Assume an upright plank position on the floor with your weight held on your hands and toes. Keep your elbows locked.
Reach one leg, as far as you comfortably can, to the opposite side under your other leg. Hold this position as you lower your pelvis as far as you comfortably can towards the floor. Keep your chin tucked as you lift your head and chest up and back as far as you comfortably can. Hold for a 3 to 5 count. Relax for a 3 to 5 count. Repeat on the opposite side. Alternate for up to 8 repetitions on each side.