Those of you reaping the (un)happy rewards of a Christmas spent gorging on chocolates and mince pies will be delighted to hear you can burn an average of 324 calories each day simply by going to work. Apparently, commuters in London burn the second highest amount of calories in the UK (narrowly beaten by Cardiff) at 378 calories – that’s two packets of Maltesers to you and me. The news was brought to us by Virgin Active, presumably confident that telling us how much exercise we get on the Tube won’t stop us spending our Christmas money at its gyms. Virgin Active prescribes “bum clenches on the Tube” to burn an additional 50 calories. Er, no thanks.