Credit: SWNSbr br Meet the all-action grandad who still does martial arts every day - at the age of 92.br br Lew Burja credits his long-lasting health to tai chi and kung fu.br br He started in his 50s after a bout of chest infections and niggling pain in his back.br br Forty years on and the grandad-of-three is fighting fit.br br Lew, from Leeds, can still walk up to seven miles a day and can easily run to keep up with his grandchildren.br br He is also training to become a thriller writer to keep his mind sharp.br br Lew said: "It's incredible what [martial arts] has done for me. It's a lifesaver.