I've been motivated by the Fugly blog to post a training for riding tip that I've found invaluable:
I started with my current trainer last February. It was maybe my third lesson with her when she looked hard at me and said, "you lean a LOT to the left."
"Huh," I said, and then I went home and thought about it. I've had a couple of different trainers over the years, both huntseat and dressage, she's the first one who's ever said that to me and she was completely right. I remember that I used to find myself trying to jerk my saddle straight during trail rides because it would always slide to one side. It never occurred to me that the saddle slipping was my fault, obviously it was.
Now that I knew I had this problem I was determined to fix it. Fortunately for me, I work at a college with really good physical therapy and exercise science departments. I happen to know a professor in those areas that rides dressage, and I asked her for advice. She told me that muscle imbalances in the body could be the root of my problem and that I should ask my personal trainer (another perk of working at this school) to help me find out where those imbalances were.
So I met with my trainer at the gym and we found the root of my problem, one leg was noticeably weaker. So how did I fix it? I changed how I use the weight machines. If you use both legs, the stronger leg will compensate for the weak one and the imbalance will remain. I now use all the leg machines one leg at a time. I started doing one legged squats and step-ups with an aerobics block. The point being to really isolate each leg and get them to be evenly muscled.
It worked! After only a few weeks, my lean was greatly diminished and I was sitting squarely in the saddle. I know I'm not the only person with this issue, so I'm passing this along in the hopes that I can help someone else. Paying it forward!