Watch Big Balls: Fitness Ball Workout (1970) : Full Movie Online Free BIG BALLS shows you a Fitness Ball Workout as you have never seen before! Two FULLY NUDE GUYS will show you a fun and innovative way to freshen up your training program. Because the ball constantly challenges your balance, you have to work your deep, core muscles to remain steady. One to two sets of hand weights, a floor mat are recommended, along with a fitness ball. Please consult your physician before beginning this or any other exercise program.