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When it's raining or too hot outside, I like to use the Leslie Sansone's Four-Mile Intensity Walk DVD. Also, here are some good target exercises that you can do at home without special equipment:

http://www.easy-weightloss-tips.com/target-exercis...

I probably would have said WoW too but I don't know about men 8-18, that may be something on X-Box Live, perhaps something like Call of Duty 4. A very large percentage of WoW's community is going to well over 18. If you're fishing for a new game for a man ages 8-18 I think World of Warcraft, Call of Duty 4, or Grand Theft Auto 4 would all be safe bets currently. Each game is very well made and offers quality online play.

The most popular exercises are cardio and running.