Which way you turning it?
Good ol stamp ftw.Righty tighty lefty loosey irrc.
You need a bigger bar. Air gun will have no chance if jumping on a breaker bar isn't shifting them.
You joke... but before I had a breaker bar, I once used the washing line.
^ What gun you using? We've got a Snap On item at work and it's pretty fecking powerful tbf but I've still seen myself having to use a breaker bar to undo some wheel nuts.