We recently got a 15 year old POA pony who's been very calm and gentle. He was very bonded to me and very friendly. We've had him for about 3 weeks. I'm like a baby when it comes to horses and horsekeeping.
I had such a difficulty sending him away - i'd try to send him off and he'd look at me like "what? you want me to GO?" Plus we have him in a tiny paddock that's about 24' x 36' (too small to do join-up i thought) and that is within a fenced property that's about 1/2 acre (which i was worried would be too large) AND we've got easily two feet of snow (making the sending away and running quite difficult).
But today I decided to just do it.
So i took off his halter and using a long fishing pole as a lunge whip, I spooked him off. He took off running. I ran after him. He'd slow and I'd shoo him away again (sometimes it'd take me a minute to get over to where he was) and get him going again. Because of the snow I wasn't able to keep him going in one direction for a long time and then the other, it was just more of an experience of "get away! nope, keep going..."
After a while, maybe 5-10 minutes we were both winded and he was looking at me and i was looking at him and I decided to see if he was ready (i saw the one ear turned when he was running and the licking a chewing a little bit and the slowing), so i turned and he immediately walked up to my shoulder and stayed there and then walked wherever I walked.
I was so proud and AMAZED that this thing worked for ME, a really novice in less than optimal circumstances.