Try the Stairs

To add strength to leg muscles and get a cardiovascular workout at the same time, try climbing plain old stairs. This can be done at home, in your office, apartment building, or on stair-climbing machines in the gym. Climbing two steps at a time is good for building the quadriceps (thigh muscles) and the gluteus (butt). Going down steps builds strength in the quadriceps and to a lesser extent, the hamstrings.