I think wild kids are normal kids and the problem is not their energy, they need to be offered proper ways to channel the energy! All kids have both physical and mental energy bank that needs to be emptied regularly - and if you don't do it properly it will be directed to what parents consider "bad behaviour".
The colleague of mine has got a 9 years old son herself so she is somewhat familiar with what boys are interested in. Naturally they will play X-Box, PlayStation or what have you if you give them a chance.
But also they are likely to enjoy outdoor activities and games if you just offer the option and encourage it. Don't be lazy - take the effort and join the game, you might enjoy it yourself too!
What can you do with such "wild" boys then?
Yep, I heard they only wanna play the consol games but so what...
From top of my head I suggested few things that I'd even like to do myself;
Take advantage of the winter, take a sleigh with you and hit a nearby hill. It doesn't need to be a big one, just a hill. Running up the hill for an hour, playing in the snow and having a snow ball fight I can tell you a cup of hot chocolate tastes fantastic!
Afterwards, you can play cards. A simple game you can play is called "7" - it is played with regular deck and is similar to UNO. Then there are plenty of board games from traditional Monopoly to various different ones. And you should not forget Yatzy, the dice game.
After the colleague's baby-sitting I asked her what did they do. The answer was a dissapointment:
They were playing the damn Playstation...
Please take the effort and be active, stimulate you kids - and don't forget the books!
I was thrilled to see we have been using some of them. This year again we went to the ski trip with a car, just like we've done since they were small - and we have always managed without GameBoys or DVD's. Surely they make the trip smoother, but also more boring.