I want to start training for a triathlon. I have started running in a group (at the back). 4 miles in an hour. am joining a cycle group and don't find it difficult to build up swimming fitness. I've bought joe friels bible but it looks so confusing. I don't know how to get started. I don't want to join the local tri group until I feel a bit fitter. Should I just focus on getting running a bit more and cycling before embarking on tri training?