The RPI Marathon Stick is a self-massaging stick made to give you light to deep tissue massages (specifically for your legs). The Marathon Stick is intended to improve your strength, flexibility, and endurance, not mention prevent muscle injury, by warming up your muscles BEFORE extreme use, but also expediting the discharge of lactic acid AFTER extreme use as well. The Marathon stick is segmented in 9 different parts so it will have some really good flexibility as well!