So I haven't actually tried join-up, as my trainer told me not to (and I don't really know how...)
She told me not to, because the last time someone tried join-up with my horse in her round-pen, he tried to jump the 5-foot fence, didn't clear it, got tangled in it, and ended up with three legs in the fence or something, and one on the ground. I didn't see it, but that's what I've heard. My question is: why? Why didn't he want to join-up?! I think it was my trainer's teenage son trying it, possibly with an older man too. They were probably doing it correctly. Should I try it, or should I take her advice and bond with him somehow else?