I do nrol4w workouts M, W, F, I ride english saddle on tuesday nights.
Rising trot is the evilest thats for sure. My teacher used to be a powerlifter though so she doesn't object when I pull into the center to let my quads ease off She thinks I'm nuts and am gonna kill myself at this rate but hey..
I look at it as bw endurance training
So far it doesn't seem to have hurt me at all. By wednesday nights workout I feel good to go again. On occasional weeks where I have missed my lesson due to rain etc I haven't really noticed that much difference on that Wednesday's workout.
I've even been contemplating adding another lesson in on Thursdays.