The TRX is a great strength training tool and program you can use at home and some gyms offer classes with it, too. It looks like resistance bands but isn't stretchy; it allows you to strength-train using your own body weight in a variety of ways. It hooks to a door, tree or other secure pole.
It comes with DVDs, workout cards and great instructions. You can modify every exercise to fit your level, beginning or advanced, and all of the exercises work your core and really challenge your body in unique ways. You can work every major muscle group and adjust it easily. www.fitnessanywhere.com