I'm buying a horse from the tracks and retraining it. I have found one I really like and I'm planning on bringing him home but he's only 3. Obviously he's still going to grow and mature a bit until he's 5 or 6, but I'm hoping to get him in a regular riding schedule soon. He raced a couple times as a 2 year old, and has been started english, but I'm worried he might be too young? Should he be okay to continue his training under saddle at his age, as long as I don't ride hard every day? What are people's opinions on when it's safe to start doing small jumps/raised trot poles once or twice a week? Could someone give me an idea of a general timeline they use to train their horses?
If it helps, I'm not heavy and he could carry my weight no problem. I'm mostly worried about the impact on his legs and setting him up for injury in the future.