Here are 3 quick tips:
- stand rather than sit
- walk rather than drive
- take the stairs rather than the lift
Do any of these as a break between tasks when you are sitting at your desk. Take a 5 - 10 minute break every hour of your working day. Get up and walk briskly to the printer, or to the street for some fresh air, or to visit your friend on the next floor, or to go to the toilet. There are many ways you can make sure you get up out of your chair and walk briskly to where you need to be.
This can include getting off the bus one stop early, or catching it one stop later! Remember to set your alarm a little earlier so you can catch that bus okay!