Interesting to read your post re hydration. I've always seemed not only to perspire more than most people, but my perspiration seems very salty (no, I don't compare mine to others).

I recently switched from plain water or alternating with replacement drinks to drinking "ultima replenisher," a sports drink with no simple sugars, during all my cardio off or on the bike (note, no commercial interest). I feel better both during and after. I used to feel waterlogged and headachy after a hard workout--I think it was from too much water without enough electrolytes.

Ultima replenisher isn't easy to find, but it's worth it. It comes in both tubs and packets. PS, I don't care for the wild berry flavor, but perhaps that's just me.

Congrats on do the 150 in hot humid weather. I believe you get extra credit for that!