I started playing indoor soccer about two months ago. Haven't played over a decate, I almost passed out after 5 minutes in the first match. After playing 6-7 matches, I feel much stronger and faster with much quicker recovery from exhaustion. I also lift weight two three times a week and now I have to control myself not to run over the opponent. Today, one guy got angry because I was too physical. Man, what a change.
Once I read that playing a competitive sport (basketball, soccer) is highly recommend if you are over 35. I think I understand why. Also, I'd like to suggest anyone over 35 to pick up a competitive sport.