Incorporate the Strong Core and Back Kit into your weekly workouts for a stronger, healthier back and firmer midsection. This unique peanut-shaped ball is key to helping engage your core more efficiently with every exercise. Stretch and strengthen your spine while increasing your range of motion. Kit comes with an anti-burst CoreFit Ab Ball that’s free of six of the most harmful phthalates. DVD includes two 10-minute workouts: “Core Focus” targets those hard-to-reach places helping you build strength throughout your midsection; “Strong Core and More” adds more challenge with standing moves requiring greater control and concentration. Bonus feature, “Back Pain Relief,” delivers a 10-minute stretch routine. Ball pump included.