It’s easy to kid yourself that your body is a machine and that your arms are hydraulic pistons that can cope with anything What is it? Sit on a bench with your hands either side of your bum. Now inch ...

When I discovered that my favorite tricep dip machine was called "the Gravitron" (duh duh dun), even I was a little intimated. From crazy names (crossover cable what?) to questionable positions (am I ...