Ow! That does not sound fun CJ82Sky! Glad you're back in action though.
I like the transitions in the serpentine exercise! I'll have to try it with Zeus. We definitely can't do enough transitions. Need lots of work on those. What I've been doing lately, (that is very similar) is to do trot/canter/trot, and walk/canter/walk transitions on a circle, usually about 20m. As well as trot work in a 20m circle, spiraling in to a 10m and leg yielding out to the 20m again. It's harder then it seems! Especially the trot/canter/trot transitions for me and Zeus. We can do walk/canter just fine, but trot/canter is a completely different story, ha ha.