First time I've used my round pen at my new farm. I had to shred it inside because the weed bushes were as tall as we were. Henry is a young thoroughbred that was used as a camp horse unsupervised with children that hung on his face so now he has an aversion to rein contact. I was reading a book called "beyond the track" which inspired me to bust out ye ole dusty side reins to help him with this affliction. We started on the loosest setting and he had no problems. And although I went up a few holes on the side reins it still would not have been effective considering I learned I no longer had a lunge whip and me using the end of the lunge line was an ineffective driving aid. All for the better because I found out a corner of my round pen has unsafe footing (deep sand, sinks hooves too deep for my liking). So he got very mild exercise while being assumed reintroduced to side reins. I purchased a lunge whip tonight and will try again at the barn on better footing where we can *really* utilize the purpose of side reins. I'd rather have him relearn how to balance himself without me bothering him about it on his back when clearly he isn't strong enough after being off for 6 weeks. I have him in a happy Mullen mouth bit with a micklem. I hope this helps him learn to accept rein contact better.