The highest I've ever jumped is 5. I'm hesitant to go much higher because the idea of going over a jump that's as tall as me or level with my horse's back is a little terrifying. In his heyday my horse used to jump 5 ft fences but the most I've ever asked him to do is 2-2.6. We have done 3.6 but it was a downed tree and it was completely unexpected. He took it like a pro, I thought I was going to have a heart attack.
I've been preparing my horse (on the ground) for jumping for the last month and a half and finally had our first jumping lesson last night. He had never jumped under saddle, and I hadn't jumped in 3 or 4 years, and only tiny jumps back then. Here's the combination we accomplished (under saddle!) by the end of the lesson:
3'5 :) it isnt especially high but I was very proud of myself and my pony, more my pony he did all the hard work I just set him up, he could've gone higher but I thought i'd end it on a good note and call it a day