Find a way to work a small amount of exercise into your daily routine. Walk places instead of driving, do some jumping jacks in the morning or before bed, something simple that you can get yourself to do without much stress or planning. If you do it consistently, even 10-20 minutes of exercise a day can make a big difference in the long run.
Everyone knows pro wrestling is all staged performances but I’ve never heard that said of boxing. As far as I know those are real.