I started playing online video games with a friend and his son, and they do one exercise between each game. Pushups, sit ups, dumbbells, etc. After a 90 minute gaming session, I've also done one circuit of exercises.

I got the 5 to 90 lbs powerblocks (700 Canadian used..) but with the way they are built I'll be able to use them 50 years from now. Just a solid long term purchase.