well some thing that I tought my horse to do was to give kisses, all I have to do now is pat my chest just benith by throut and he streches his nose out and they kiss his nose lol, he gives kissing all day long to me, I feel its a great way to so just how much I love him lol,
When he has an apple or carrot he also says please, I hold the tip bit in frount of him and say to him, what do you say? And without fall he winnies to get his treat.
Some people say don't humanise them but I think its cute,
So you could teach you horse to give kisses and say please.
To keep muscles suttle I do bending work,
My horse stands freely in the yard and I have 4 carrots normally. I stand to his left flank and hold one carrot out so he streches round and reaches the carrot, I do the same on the right, then I stand infront of him and hold the carrot as high as I can so he strechs to get it, next I bend down next to him facing foward and hold the carrot inbetween his frount legs so then he strechs down and bows to get the carrot. That's just and easy way to keep him flexed when not doing a large amount of work!!
That's just a few thing I do with my horse that should hopfully be comfortable for you to do