40lb in 4 weeks is too fast weight loss. Not healthy.
What I find interesting is which muscles ache after. I run a lot, so legs are fine, I feel some reaction in my thigh muscles, but nowhere near what i get after a hill training session.
But if I am on top, my shoulders and arms feel it after, the only exercise they get is sex.
Libido is interesting. After a hard running training session, I lie in the bath and relax, and often get an erection. Maybe it is just the warm water taking effect. But no doubt I usually want (but rarely get) sex after training.
I think I have read it is to do with the chemicals released during hard exercise.
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