One fell swoop

You wouldn't know it to look at him but Matthew Robinson used to be fat. Now a personal trainer, he runs up mountains for fun. As he launches a new get-fit plan for G2, he takes Helen Pidd out on the hills.

Knocked out

Tim Dowling: I've been doing boxing training once a week for about four years, with more or less the same group of people, though occasionally one of us moves away or is invalided out.