Hi guys. Been stepping the training up lately to include some harsh hills. But I know that doing this too much is inevitably gonna fcuk me up. I'm starting to feel it after a weeks worth of thrashing. I remember reading that you can do something called "rest training" or words to that effect. This usually includes low impact training such as swimming, bike riding, etc. What I'm trying to get at is that whilst I'm giving my joints a rest by doing low impact stuff is there a way to replicate the cardio I get whilst beasting hills? TBM ps: I'm not a very good swimmer so I'm leaning more towards the cycling route. pps: Whilst I'm on the subject of training. Is it true that you peak at certain periods of your training cycle (ie: every 6 weeks or so) and is there a way of working it out so you peak at the right times?