To build strength in leg muscles and get a great cardiovascular workout at the same time, avoid the elevator and climb some stairs. This can be done at home, in your office, condo building. Climbing multiple steps at a time is especially good for building strength and power in the quadriceps (thigh muscles) and the gluteal muscles (butt). Going down steps also builds strength in the quadriceps and to a lesser extent, the hamstrings. So take stairs up AND down for the health benefits!