Call me introvert or not, before doing the exercise I feel a little resistance to do it, but after - feel very energized. For parties: it's diametrically different - feel big boost of dopamine before party, but after - I feel some regrets, so I'm just trying to not think about later.
I don't feel regrets per se, but I do certainly need to recover, while after exercise I feel good. Regular exercise usually makes me more likely to exercise more, while with social functions that's not viable for me.