If you are sad like me, you really do spend hours leafing through old books. After a while you begin reflecting on the bar muscle up. Its not an easy skill, and it requires a fair bit of specific strength, and a helpful “crunch” at the crucial moment.
In the learning stages, maybe lever yourself up with a leg and practice popping that elbow into the air as your leg wooshes down.
Thanks once more to the gymnasts of old!