can push against the ground get greater force, lock your arms and push with your legs, pushing down the way youll only get your body weight unless you are jumping on it, exhaust bolt either cut it off knock it out, or drill it out from the back then put a new bolt in
small bit of physic into the equation lol, levers increse force, the bolt should be around 200 NM, probably 400 now taking into account its seized, i.e 40kg at 1 metre, so on a 50cm bar thats 80 kilo,