Only 15 minutes ridden in the arena.  Very hot, very humid.  Too much.  BUT!  We had a productive 15 minutes.  Poor Balthazar is used to our routine - ZZZZZZ to our routine.  So today we changed things.  Quick few games on the ground (already feeling my brain being fried by the sun) and then dropped my bum into the saddle, which sizzled -  black leather, very hot!  Gritting my teeth against the pain we started off.  Rode him straight to the short end of the arena and asked him to step over the log.  You'd think I was asking him to step off a cliff.  But we NEVER go over the log.  We do today.  So we wobbled and wavered and finally stepped over the log.  Then a few weaves at the trot, backing through the gap at A, asked him to full pass over the end of a log - too much.  He was as resistant under saddle as he was on the ground.  Had to be satisfied with him standing next to the log.  Which was really quite a big deal.  He was walking forward away, ignoring my leg or moving into my leg or backing up.  Standing quietly in position as if we were going to full pass over the log was quite an accomplishment.  We did full halts, figure 8's, changes of gait and walks or trots on the outside of the arena.  Noticed he either sucked back when he felt overwhelmed or became very forward.  Not in a scary way, just really pounding along.  At the end asked him to full pass over a witches hat.  He didn't but he did get half a step over it.  Told him how wonderful he was and jumped off.  Balthazar nickered (he talks alot actually).