The balance ball coach helps you strengthen and coordinate many key muscle groups including core muscle, back muscle, legs and abdomen. By adding an element of instability, it forces your body to use more muscle from your heart so you no longer have to rely on crunch exercises or sit down to exercise abs. Resistance tubes are directly linked to the base for other body weight resistance exercises and add an additional dimension to your standard exercise. Ideal for physiotherapy and recovery exercises. Advantages: - lightweight and easy to carry - includes pump - includes rubber resistant trainer - durable explosion-free material - slip-free/tag-free base