zip up, zip out
If they zip your hands in front. Usually they don't.
If they zip your hands behind you, I guess you'll wish you hadn't blown off that mobility / flexibility work people kept telling you would pay off eventually.
You just slip out the back, Jack
The first one should work even if your hands are behind you, it just means you have to be thinking about it BEFORE the cuffs go on, instead of after.
if they zip your hands behind you, they will probably use much stronger zip cuffs than can be broken by method 2