Yes, exercise is always a good thing. He might be bored. What you need to do, is tie him to you. When he goes to chew on something he shouldn't, interupt him and offer something else. He'll get the idea. If he dosen't, try using a water bottle and squirt him. Make sure he is outside about a half hour after his meals. Don't free feed him, keep him on a schedule. Make sure to pick up food and water at about 6 pm, or a few hours before you go to bed. He will come around eventually. Keep it up with the crate.