Side Lying Bicycle is a mat version of an original Pilates exercise usually conducted with springs on the Cadillac. Balancing on the side strengthens the core and the fluid controlled movement of the legs tones all the muscles around the legs and increases flexibility. You'll be ready for those summer skirts in no time! Visit http://PilatesOnFifth.com/video for more info. Now, Pilates on the Go! - Workout DVD is available from http://Shop.PilatesOnFifth.com