Dressage lesson after Charlie's vacay

I tried to be efficient with personal life and Charlie, but he ended up with a three week vacation instead of a two week vacation.  We saw John a month ago for a great lesson, and I rode Charlie this week to get him ready to go back to work.
First, we went over rider fitness, following up on our last lesson.  For prelim, John says I have to take it up a notch.  Ideally, I'd be running 6 miles 5 days a week by show season, but because of my dumb foot, I've got to bike.  John says I have to do about triple the mileage on the bike for the equivalent of running, so about 80 minutes on the bike at about 80 rpm.  John also had some suggestions for PF treatment, which made me realize I have been ignoring it for far too long (since July) hoping it would go away on its own.  I need to be more proactive because I'd way rather run than ride the bike for hours and hours.
Then we got to work.  He reminded me of the three topline exercises we worked on last year (which I should have looked up on my own; that's the entire purpose of this blog).  One was spiral circles in with a counterbend and leg yield on the way out; one was shoulder-in on a long rein; and now I have forgotten the third.
I told him about Charlie leaping around like a mad man on Thursday when I tried to do a serpentine to the quarter line at the canter, and he said "you started flying changes again didn't you?" and I confessed that I had, and he said just leave them alone for a while and we'll work on them later.  (He also knew Ashley's horse was bucking with the eyes in the back of his head and how she was riding at that moment!)
I told him how Charlie was stiff and heavy on the left rein at the canter, so the first thing we did, when getting ready to canter right, was ask him to pick up the left lead on a right hand 20 meter circle which made Charlie have to spend a lot of time thinking about his legs, so after a few tries, when he didn't get it, and I asked him to pick up the right lead, it was quite lovely.
For the left lead, I asked him to bend his head way to the inside, then would very softly put it back in position.  I'd also lift my hand 8-10 inches up, and then pull back with bicep.
Charlie was great.  The Legend booster he got a few weeks ago really seems to make a difference, so my plan is to do injections twice a year and then 8 boosters.
It didn't feel like we rode that long or that hard, but Charlie was quite sweaty (I haven't clipped him yet), and he has not gotten anywhere near that sweaty on our regular rides at home so I guess I'm not working him hard enough.
It was a great lesson.  I'm so lucky to have John.