The Sprinter Stick is the firmest of the short Sticks, thereby making it the most versatile of the short Sticks. A light to deep massage is controlled by the pressure of the user. Primarily used on legs. A favorite for athletes "on the road" as it perfectly fits in most bags and of certified and personal athletic trainers for applied myofascial release. A great model for unassisted use on muscular lower limbs. It's the perfect stick for well developed legs.