In this age of high-tech equipment, this Black and Gray, 12-lb. GoFit GF-MB12 Medicine Ball is very simplistic, yet incredibly effective in training the whole body through a complete range of motion. Medicine Ball training is designed to allow you to more fully access your muscle strength. You also become more resistant to injuries. The medicine ball provides resistance through a full range of motion to abdominal exercises. This means you will be able to keep the abdominal muscles fully loaded with resistance through all planes of movement. By keeping your abdominals fully loaded through a full range of motion, you will develop your abdominals in a much faster period of time.* Before beginning any weight loss or exercise program, you should consult with your physician.