So a back story first; yesterday I played some badminton games with my friends, and I kind of pushed myself a bit harder than usual.
Usually I'll get out of breath after 2-3 sets of a game (I'm easy to get out of breath, and have low stamina), but yesterday I pushed myself to play 4 sets. To my surprise, when I was exhausted in the half of the 4th game and tried to adjust my breathing, I suddenly felt some kind of surge of energy.
My breathing suddenly became stable, I was sweating less (which is rare because normally I sweat a lot, by a lot I mean I'll just standing doing nothing and I'll sweat bucket), I felt a bit stronger, and recovered my stamina.
This is not my first case and I'm wondering if this "surge of energy" thing is normal or not. I'm a bit overweight (92kg 178cm) if that matters.