exercising

My son wants to play video games all day and has become obese. He is like over 300 lb and lazy and when I try to get him exercising he'll try it for a little while and then quit. Is there a strategy to get him to work out and start weight training that will be fun for him. Any tips or advice for...

Will i lose a lot of muscles from doing absolutely no workouts. I'm planing a trip for 2 weeks when i probably won't have time to workout. What is the best way to preserve the muscles. Thank you