@Scott I guess that like in other areas of life, we sometimes need to make painfull mistakes in order to improve in the long run! Besides that, I totally agree that consistency is key here.
@pshyvers 95% percent of my workouts are between 1 to 2 hours. For anything above 1 hour I always take my bladder with me (plain water) and drink from it when I’m thirsty. On a hot day I could drink up to 1L of water during a 2 hour workout. I also make sure that my post-workout meal is generously salted. Other than that, I eat a lot of mixed salads, which should take care of other micronutrients requiremens. Counting in the water from vegetables and fruits, my intake averages at around 3L per day. Could the fact that I don’t do any isotonic drinks be an issue?