For this exercise a fitness ball, or sth, is required. This ab exercise is used to train the abdominal muscles and oblique muscles. The athlete has to go through the illuminating SmartGoals with the fitness ball, while balancing on his/her butt, keeping up both legs and upper body. Maintain (lower) back straight with shoulders backwards. | Coach on: maintaining posture, tighten the abs (not the lower back) | Physical: abdominal muscles, oblique muscles, rectus femoris |