Prince William knows that if you treat yourself, you have to hit the gym. During his visit to Swaledale, a valley in North Yorkshire, the Prince of Wales joked about amping up his workout routine while eying chocolates. According to GB News, William told the farmers he'd "be in the gym for three days" if he ate all those sweets. Kate Middleton and Prince William join a training day with runners taking part in the 2017 London Marathon. By: MEGA "That is a Twix mountain of calorie grenade!" the future king of England remarked. "I have my eye on the chocolate," William admitted.