George W Bush was coached by his managers to alter his walking style. He learned to turn his arms so that, as he walked, the backs of his hands would face forwards.
That pitches the elbows out and this additional apparent bulk is believed to make scrawny types look more imposing when seen on TV.
The trend has made it here now.
If you are quick you can catch Colin Craig on the six pm news on TV1's plus one channel.