On BBC One’s ‘How to Beat Pain’, Dr Jack Kreindler and Professor Greg Whyte look at the key facts about chronic back pain, osteoarthritis and acute pain, using themselves as guinea pigs to show how these debilitating conditions can be treated.

In one clip, Prof Greg sends Dr Jack into the ring with ace cage-fighter Nick ‘the Headhunter’ Chapman, to show how they would treat a sports injury…