Challenge Christian Malcolm: American Football
Christian Malcolm finished fifth in the 2008 Olympic 200m final in Beijing and has won medals at World, European and Commonwealth championships - but has he got what it takes to play American Football?
In the first of a series on the BBC Sport Wales television programme, Malcolm tries his hand - and shoulders and legs - at gridiron.
And it proves to be a tall order even for a man who has run against Usain Bolt.
Watch Sport Wales at 19:00 GMT on BBC Two Wales and on iPlayer for seven days after transmission.