Some people do spins, jump and go over the bar when do muscle ups. Once you are up there, all the fun stuff is natural.

The hardest muscle up is the way two people do it. There is no video on youtube with someone else doing like that. Wide hands.

One guy is Andreas Aguilar

The other is Hannibal or Hannibal for King as they call him on youtube.

That's something to try to go after.