רציונליות ישראל

"Arrive at the mall at 19:00 with sport-clothes", said the google-calendar invite from my girlfriend. And here I was, trying to guess what today's date will be.
Oh, here she is 🙂
After some hugs and kisses we find our way to a group of 50 people or so, outside on the grass, warring sport clothes but not looking fit at all. We join the noob group and start our warm-ups.
"It's a hot day", says my brain, "But this will be fun, we ride bike a few times a week, so we'll probably be the most fit here and enjoy winning :)".
"This looks like a fun date!", I tell my girlfriend.
Push ups? No problem, I do them the fastest. 30 seconds of Squats? No problem, I'll do double the amount of anybody else.
Bug man, I'm getting dizzy.
"Is this an excuse not to work out?", asks my brain. "No", I reply, "I think it's objectively better for me to take a small break".
"OMG", continues my brian, "We ARE dizzy! And we are getting more dizz—" – "Calm down, brain! Ok, we'll take a break, you don't have to freak out for me to do it".
The instructor comes over and I tell her I'm a bit dizzy. Actually I'd like to sit. I do. My girlfriend asks me if I'm ok, an always annoying question.. She offers me water but I have my own.
I'm actually really weak. WTF. "All the other people seem ok", observes my brain.
I think I feel like lying down a bit.
The instructors keep asking me if I'm ok. "Stop asking that". I can only whisper. At least it's an annoyed whisper.
I update my girlfriend on everything I know about how I'm feeling, because I assume her brain will be in a better position to analyze information and make decisions than my one. Oh, and so that she can answer the stupid instructors and keep them off me.

Once my brain had enough energy again, it started running a thread to search for possible mistakes that I made which lead this situation, and obviously, for code patches to apply to itself which will prevent this from happening again.
The #1 candidate is "I didn't drink enough".
Well, I live in Israel, and it's hot here. (That's what other people say, at least. I think the temperature is totally normal).
There's no way I'm going to almost-faint, or even get partially dehydrated, every time there's a hot day and/or I'm doing sport outside.
I am going to drink enough. I don't know how much is "enough" or how I'll do it, but I will.