muscle up

Short definition from Wiktionary

Verb

1. 1
   To train the muscles for increased size and strength.
2. 2
   To force one's way into or through.
3. 3
   To make stronger or more powerful.

Noun

1. 1
   An exercise done for strengthening the arms and upper body, in which one lifts one's own weight while hanging from a bar to a position above the bar.