So I've bought myself an exercise bike and I'm keen to get fitter. However even at low intensity I'm getting quite unplesant pain down the back of both legs and I have to keep stopping and standing up and stretching it out. Its kind of from just below my bum to my knees, then a bit in my calves too. Any ideas which bit of me is likely to be complaining? And what I can do to sooth it? If it doesn't ease off I'm never going to be able to cycle for more than 5 minutes!!