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Eat healthy food. Don't smoke. Always take the stairs instead of the elevator. Drink water instead of sugar drinks. Take breaks from sitting. Either walk for a few minutes outside or get a height-adjustable desk and work both standing and sitting.

Also find a sport that doesn't bore you. Maybe you need to do a team sport to get motivated? Did you ever do a sport that you liked? Maybe try it again. You don't need to run if you think it's too boring but doing it occasionally certainly is a good idea.