Leg pain in rising trot?
So I've been riding about 2 years now, and do weekly treks, where I've learned to walk, trot and I'm working on cantering. Up until last December, everything was fine, and I was really working on improving my posture in particular.
I got on my favourite lesson horse, an older gelding, and while we were leaving the yard, he put his head down for grass while going down a hill. I pulled him back up, but in doing so I think I strained my thigh muscles while trying to maintain my balance.
When we got out on the road (me, instructor and another rider) we went for a trot. I noticed that I struggled to push myself out of the saddle when rising, and during this particular lesson, we did a lot of trotting. I felt like I couldn't really ask to slow down, because the other rider has a lot more stamina and experience than I do, and if we didn't go quicker we'd be late coming back to the yard. I ended up having to use my hands to balance on my horse's neck, my legs were so sore. It was like my legs couldn't hold my weight.
Over the course of the past few months, the pain sometimes eased off, especially when I went riding with less experienced riders instead. I mentioned it after a lesson one time to my instructor, but I said I didn't want to quit riding. We've done a lot of liberty lessons in the arena since January which I worry has stopped me getting back my strength in a consistent, gradual way(since at one point it was almost 6 weeks before I did a proper hack again). Some weeks I can trot for ages without feeling sore, but other weeks are agonizing. Today was one of the worst, I wasn't feeling great to start, and by the end of the trek, I was exhausted, in pain(in both my ankle and thighs) and nauseous. I think the incident on the hill might've caused my problems, but I don't really know how to build back up my muscles to how they were before? Sometimes if I'm in bad pain I'll try sitting trot, but since my horse is older, it doesn't feel fair on him. Any advice on this?