In the footage, two friends are seen descending the stairs. The first man walks ... a silly walk, causing him to trip and fall forward. After the fall, he quickly stands up, and both friends ...

He lost all muscle and couldn’t walk. We made this to help him get up and down the stairs. I've been to 30 tropical islands. From Bora Bora to Barbados, here are the top 5 I'd visit again.

How many flights of stairs can you climb in a minute? Discover what your stair count says about your fitness level and learn ways to boost endurance.