Please explain the science

Yesterday I posted about how upset I was that my weight loss seems to stall when I work out... I worked out all last week, and really how it makes me feel, but like I said I either gain a few ounces or stay at the same weight week after week... If I do not work out I loose almost a pound a day... I'm eating a bit more on workouts days, but taking the advice to stay @ 1500 every day no matter if I work out or not... Bit can anyone help me on the science part of it? Is it water weight that I'm loosing? And water weight that I hold onto when I work out? I have to admit that I like seeing the numbers drop, since I'm trying to get to a healthy BMI number.... I just can not figure out why I loose so much when I'm not working out, if anyone could explain it all to me my brain would be much relieved! Stats-5'3, 42 yo female, 181.7 as of this morning....lost 41.7 pounds since March through diet & excersize...45 more to go...thanks so much!

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why are crossfitters ripped? I am looking for a science based answer :)

I got into a debate with a bro at my gym, he said I should be lifting less weight, higher reps, squatting to just above parallel, etc. blah, blah, blah...

Anyways, he did get me thinking with the higher reps, why are crossfitters so lean?

is it genetics? are they actually lifting enough to build myogenic/neurogenic tone?   any response is welcome, but I really want understand the science behind it.

I don't plan on changing my routine anytime soon, but is there benefit, in high rep, moderate load work?

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