To stay active while working a desk job, incorporate movement breaks throughout the day to stretch, walk, or perform light exercises. Set reminders to stand up, stretch, or take short walks every hour to break up prolonged periods of sitting. Use a standing desk or adjustable workstation if possible, and consider incorporating active seating options like stability balls or ergonomic chairs to engage core muscles and improve posture. Look for opportunities to move more during the day, such as taking the stairs instead of the elevator or parking farther away from your destination.