The ring dip is among the more difficult — and critical — CrossFit movements to master.

• By Bob LeFavi, Ph.D., CSCS, USAW

A guide to butterfly and muscle-up progression

• By Abi Reiland, CF-L1

The muscle-up is a great upper-body movement to develop strength, flexibility and coordination on the gymnastics rings. Here's how to do it.

• By TheBox

Mastering gymnastics makes you a stronger athlete in virtually every other way, but far too many CrossFitters downplay its importance. Here, we demystify the key gymnastics moves and offer a basic blueprint for improvement.

• By Eric Velazquez, NSCA-CSCS

CrossFit has been regarded as being responsible for saving American weightlifting. Say what you want about high-volume Olympic lifts this, or movement quality that.

• By Logan Gelbrich, CCFT

The kipping pull-up is an extremely common movement in CrossFit WODs. Here's how to do it properly.

• By John Whitman

The pull-up is a great test of upper-body strength. Here's how to master this move.

• By Dave Lipson