FITNESS MAD EXERCISE SOFT BALL 9' REDMost Pilates mat classes will use a soft ball also known as an over ball as an exercise aid or tool for your mat work exercises. Our exer soft ball can help to enhance your Pilates workout and help develop strength endurance and concentration as well as to promote relaxation and coordination. They can either aid your workout or make it more of a challenge by providing resistance; use under the lower back for support or between the knees ankles hands.