The best way to resist arrest is to simply run. So many cops are just plain old fucking fat. Give them a real obstacle course to deal with. You should know that there are cops who will shoot you in the back.

Plastic handcuffs can be whittled down and cut with MEDICAL-GRADE PODIATRIST NAIL CUTTERS. Not the cheap kind you can get in any drugstore. https://www.amazon.com/Medical-Grade-Toenail-Clippers-Podiatrists-Nippers/dp/B017N5DMHM

It takes some practice behind your back. If the cops see you (often, they just leave you in a group of protestors, everyone handcuffed so they can run around beating everyone in sight with batons) they will charge you with resisting arrest. They so love doing that. That is why they are stupid fucking cops.

I have seen these clippers stuffed into back pockets and I have seen them stuffed in socks.

They will cut through wire.