Plank press on knees

GET on all fours, brace tummy and ensure body weight is over your hands. Bending the elbow, lower left side so left elbow is on floor, then lower right side so both elbows are on floor. Tummy tight and with little movement through the hips, place left hand where left elbow was, then do the same with the right, so

returning to the start position. Complete 20 repetitions on one side, then switch sides.