Your job might require you to spend long period of time sitting, but you have control over your free time. GET ON YOUR FEET. People who spend six or more hours of their leisure time sitting every day are almost 20% more likely to die of up to 14 different diseases than people who sit for three hours or less of their daily downtime.
WHAT CAN YOU DO?
Look into getting a standing desk.
Set an alarm and get up every hour and take a walk, do some squats, and stretch.
While watching television, at every commercial get up and do some balance or strength exercises.
Source: American Journal of Epidemiology