Everyone is busy. But considering what is at stake, making time for exercise needs to be a priority right now. Thirty minutes a day is not too much when you get right down to it. Cut one prime-time show out of your evening television-viewing schedule. Get up a half-hour earlier each morning. Use half of your lunch hour for a brisk walk. You can find time if you look hard enough for it.In fact, there are people who find time to manage and endorse the advantages of physical fitness just so…