This set of 2 Mini Yoga/Gym Balls also called “Swiss Ball” is an essential accessory for any yoga, fitness, gym, pilates or fitness session. Offered here in mini size with a diameter of 25 cm, it allows you to multiply the benefits of your session by working on balance and muscle tone. Its “anti-burst” design gives it significant resistance to avoid bursting and allow you to perform your exercises safely. It is extremely easy to inflate it. Simply blow through a straw. Example of exercises: To tighten buttocks, thighs and abs: - lie on your back with your feet flat on the floor and your knees bent. - place and hold the ball between your knees - place your arms on the floor along the body. - perform the pelvis raising exercise by keeping the ball between your knees.