Improve flexibility, core, and muscle strength with the Fitpro Exercise Ball. These exercise balls from Champion Sports are made of high quality Italian burst resistant resin materials, which deflate slowly if punctured or torn. Used by physical therapists, exercise balls can also be a useful part of any healing exercise routine. The Fitpro balls are backed by a manufacturers 5-year unconditional guarantee from the date of purchase, so you can exercise for years to come.