Exercising in a pool is a great way to reduce strain on your body while getting a good workout. Without any specialized underwater equipment like the In Pool Exercise Bike you are limited in the types of moves you can do. The pedals of this underwater bicycle turn a paddle in the back that provides greater resistance than biking on land which gives you a slow controlled motion to improve muscle strength and endurance. Great for your posture, balance, and flexibility too. You can submerge it as little as two feet of water; the deeper the water, the tougher the workout. The LCD monitor is waterproof. The bike is rust-proof and can also be ridden on land. Buy it at Hammacher.