When the gladiators are glistening with sweat, Alexis and co-coach Paul start demonstrating some shootfighting techniques. First, we're introduced to the guillotine, a choke move that will have your opponent spluttering for breath if done correctly. We're then shown how to take an enemy down using our legs. My first opponent is the international Vale Tudo ('anything goes') champion. He's got a knee injury and a chest infection, so I should be OK... It takes me a moment to get over the fact that I'm lying on the floor, legs wrapped around a Lycra-clad bundle of muscle. But once I do, I really get into the grappling business. It's like fighting with your kid brother - anything goes. Except here, Mummy won't come to the rescue.