Stair Climbing
Finding a set of stairs can make for an amazing workout. The motion of stair climbing strengthens the same muscles that are used for lunges and squats. Stair climbing taxes your lungs and heart as you power your way to the top. For a quick and challenging workout try: Find a set of stairs that takes 30 seconds to ascend, run (or walk briskly) up each step, and then walk back down to the bottom. Repeat 6 to 8 times.
