The Dyna Disc is inflatable with a standard ball needle and pump and available in four colors (red, yellow, green and blue), the DynaDisc can withstand up to two thousand (2000) pounds per square inch. The DynaDisc is smooth on one side with quarter inch pegs on the other. It has a unique beveled shape strategically designed for the hamstrings while sitting. The pegs on the disc can be used to increase the input to diabetics and sensory deprived individuals, as well as providing an added grip to a carpet. Changing the amount of air (which is easily done with a traditional ball needle and pump) in the DynaDisc will change the level of intensity and the range of motion experienced.