I don’t know what muscle this targets, but it’s definitely one of them

I now want a gym membership

Why does this remind me of the Dean from Community…

It works all of your flying muscles.

Probably not bad for strengethening proprioceptive movement in general. That is, if you don't dislocate your shoulder or hip first.

I’m pretty sure this is practice for wingsuit maneuvers or at least an attempt at that

Wheee!!

The lawnmower man.

Looks fun

Just remember, somebody actually set this all up in a public space, just to record themselves. Don't encourage this.

His form is terrible. Give me a crack at it and I’ll show him how it’s done.