Gymnic 28 in Physio-Roll Ball, Blue Gymnic Physio-Roll Blue Fitness Ball sized 28 in, provides an ideal medium for balance and strength training. Physio-Roll's saddle-like seat provides stability, comfort and confidence, so clients of every age and nearly every diagnosis may participate in ball therapy. Unique shape of the ball helps the therapists with activities that might otherwise be risky on a traditional ball. Sold individually. Abilitations integrations Although lighter and much more pliable than vinyl therapy balls