In an attempt to regain some fitness I have returned to cycling. At the moment I am limited to inddors work, and have set my old road bike up on a Tacx trainer. I am using the Catalyst program to cycle to a given heart rate. I am comfortably managing 40 minutes of moderate training, but there is no way I could do more, Not because of my heart/lungs/legs - its just killing my arse! Is this normal after a long spell of not much cycling. I have cycled 140 miles on this bike in a day a few years ago, but can't imagine getting close to that now! Its a cross between a really painful ache and pins and needles in my, er, perineum. Ive been cycling every other day for a week or two. Is it the sort of thiung that just goes?