Ab Solo Core Intensive Training combines the proven benefits of abdominal crunches and medicine ball tosses into a uniquely interactive, fun and effective exercise system. The Ab Solo machine, created by brothers Chris and Joe Arsenault, strengthens and conditions the abdominal, oblique and lower back muscles while providing upper body and cardiovascular benefits. Exercisers establish a controlled crunch movement tossing medicine balls against a target, either ball catch or bounce board, then retrieve or catch and repeat. Ab Solo training can be as challenging as desired by using heavier medicine balls, accelerating the pace, modifying the upper body movements and increasing the number of repetitions