I don't feel the prettiest when I work out - I'm one of those beet red-faced people who look like they are having a heart attack with the sweat flowing, not dripping, down their body even though my heart rate monitor will only say 110 bpm!
But, I do feel the most "alive" when I am in that mode.
I'd have to say immediately following intimate time with DH. In fact, that's what we do before going someplace fancy--or even to a friend's place for dinner. Take a shower, do the hair and makeup, jump into bed, jump out of bed, get dressed and go out.