Show: American Ninja Warrior

Sly Stallone would love this. During the Cliffhanger, contestants climb up a crooked wall using ledges so narrow that they only have enough space for finger tips.

The wall appears similar to a climbing wall at a gym, with some parts that go straight up and others that are tilted in a way that forces players into a more horizontal position. Climbing a regular rock wall is difficult enough; now try doing it without gear and with only a few tiny ledges to support you. You'd need the vein-popping muscles of an action star.

Really though, when can we get Celebrity American Ninja Warrior?