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Reach new fitness levels one step at a time.
A study published in the British Journal of Sports Medicine found that subjects who walked up 200 steps 10 times a week saw a 17 percent increase in VO2 max (i.e., peak oxygen uptake) after two months.
Improve your race times by pretending the elevator at your office or apartment is on the fritz—or better yet, incorporate stair climbing into your workouts.
Twenty flights per session will do the trick!