Obviously just performing more dips and going through a full range of motion will build this. I’m also a big fan of tempo dips and paused dips on parallel bars. Here are 4 more ideas to help build strength, mobility, control and comfort in the bottom of a dip:
Want to be better able to correct shoulder mobility problems in the muscle-up?
How Bench Press, Dips and Push-ups Cause Shoulder Pain
4 Reasons Why You Can’t Perform Kipping Pull-ups and Muscle-ups
How to Perform Dips and Push-ups Without Hurting Your Shoulders
7 Reasons Why Your Shoulders Get Hurt in the Gym: Part 3
2 Unique Drills to Improve Lockout and Turn-over in the Muscle-up