The Rocker Board 20" is ideal for strengthening ACL and ankle joints by increasing the R.O.M. This beginner board is perfect for seniors or anyone new to balance training. Constructed of Baltic birch plywood and a urethane rocking base, the Rocker Board allows for one plane of instability and is adjustable to three different angles: 10, 12 and 15 degrees. If you are not fully confident with your balance this is a great board to start on. Lots of short exposures each day is the best way to increase your balance reaction and core stability. Remember always keep your head up and eyes looking up in front of you.