I got back in the ring after a week off and it felt at once good and bad.
The good was mental. There is nothing that equates to the feeling you get when you out think an opponent and put on a nice combination - in good competitive spirit of course. Equally, yet not masochistically, it's also mentally refreshing to survive a furious onslaught with nose, eyes and kidneys intact.
The bad, is purely physical, but not in the way you may think. My head and body bloodied and bruised long ago have grown accustomed to assault, but protracted hands suddenly clinched into balls of pounding masses time and again seem to not have gotten that memo.