Actor Daniel Radcliffe found his latest part in TV drama MY BOY JACK to be his most challenging role yet - because he couldn't handle the strenuous work outs. The Harry Potter star plays Rudyard Kipling's son, Jack, in the First World War film, but admits the multiple takes of a certain scene left him out of breath. He says, "The only time I struggled was on one particular scene where we all had to do press-ups and Jack, as the leader of his platoon, has to do the most while everyone falls down around him. "It meant that some people would do two press-ups in a take and then fall down, some would maybe get up to 10... but I had to do about 20 each take! "I know that doesn't sound like a lot, but after 10 or so takes your arms are absolutely wrecked."