what my chiropractor told me was "ALWAYS ice before heat". Not sure why? But it works, I ice my sore, or will be sore, parts then sit in the bath tub or the hot tub, it helps a lot more thank just heat or just ice.
And from what it sounds like, it is just because you are changing the position you ride in, the more you ride, the more you'll get used to it, soon you won't feel any pain. Its just like when you first rode a horse, like actually trotted on one for a bit, remember how sore you were? I sure do! I remember complaining to my mom how much my legs hurt.
16 year old TWH Mare named Ginger
3 year old APHA Paint Gelding named Fox.
RIP Evie (Clydesdale) 7.29.09 & Magic (OTTB) 2.23.10