TAKE YOUR WORKOUT TO THE NEXT LEVEL: These Blue gym balls can be used with various free weights to improve stability. IMPROVE CORE STRENGTH, BALANCE FITNESS: Perfect for yoga or Pilates workouts, sit ups and other abdominal exercises, stretching after a hard cardio or bodybuilding workout routine, squats, aerobics, and more; a good quality exercise ball is a fantastic addition to any home gym. The heavy duty yoga ball is anti-slip and anti-burst. SUITABLE AS A PREGNANCY BALL OR THERAPY BALL: In addition to using these exercise balls for a workout, they are also suitable for use as a birthing ball, balance ball, or physio ball for recovery and rehabilitation. Their sturdy, anti-burst design allows you to strike various poses and postures to help relieve stress and improve your body and mind. IMPROVED POSTURE AND COMFORT: Suffering from a sore or aching back at office Looking to improve your posture and help alleviate aches and pains Replace your desk chair with a comfortable gym ball Their tough, portable design means they are suitable for both indoor and outdoor use.