the same time bring the left leg towards the chest. Keep your lower back close to the ground throughout the exercise. Repeat the routine changing arms and legs. 4. Toe dip Exercise works the transverse abdominal muscle. How is it done? Sit on the floor with the support of the elbows, palms of the hands, with both knees bent and the calves raised parallel to the surface. The palms will be at the level of the