I'm probably too late to this but can I offer a word of advice?
If you haven't ridden before, or for ages, see if you can have half an hour's lesson to start with because you WILL ache!
I taught a bloke a few years ago who was very cocksure of himself. He was very sporty and could ride but hadn't ridden for years. I told him he would be wise to stick to half an hour to start with "Oh no, I'll be fine, I do all sorts of exercise".... I said that's as maybe, but riding uses muscles you don't use in many other sports... "Oh no, I'll be fine"
Fair enough then. I gave him an hour's lesson.
When he got off, he said "I feel great - don't ache at all". I told him it's usually a day or two later that you start to feel it. He didn't believe a word of it "No, I'm very fit" etc etc.....
The next week I asked him how he'd felt after his lesson the week before...
"Do you know what" he said "I was in absolute f*****g agony"
