build core strength with these double and single leg plank variations on the stability ball – double knee tucks and alternating single leg knee drives. these ball buster moves will engage your total body to build a solid core from the shoulders to the quads.
i recommend starting with 10 reps {10 reps per leg on the single leg knee drives} of each exercise x 3 sets.
*you try saying ‘tiny stabilizing muscles on the stability ball’ without stuttering…