I havent used wfp but after many years of playing prop forward and weight training am reasonably strong in the arms,you could I suppose do some work in the gym or get a set of barbells and do exercises,its surprising how quickly you can progress by only doing about 20 mins a night and doing different muscle groups.The wfp'ers might be along in a minute and rubbish that but it might be worth it,just my penny's worth - good luck mate.