10 meter to 20 meter circles

We had a quick lesson tonight because fat, out of shape Duke (and ahem, me) got sweaty too quick for how cold it was going to be.
We worked on 10 meter circles, with a good inside bend, then we'd either leg yield out onto the 20 meter circle (the 10 meter at 3 touched the 20 meter at 9) or change direction and keep the outside bend, bend the haunches in, and then bend the neck in.
John said that is a good exercise for helping bend through the body, especially when he's stiff and resistant, because he kind of gets tricked by the change of direction.
After we did the circles with haunches way way in, I could really feel the spring in his back end, and it made the canter (although a bit rushed and unbalanced) feel WAY better than the canter we've had at home.
This is the beginning of our hell month, after last month's hell-of-not-riding month, and so John gets to ride him a bunch and he stays at Caber.  This will also hopefully give the rain a chance to start and kind of pack down my new arena sand.