Sitting down for hours at work is not good for your health. Using a standing desk is one way to become more active at work. Tools such as Officiser can also help. It stays under your desk and lets you move your feet to promote blood circulation.
Officiser lets you perform push and pull moves to stimulates muscles in your legs. Want to strengthen muscles around your ankles with knee stretches? No problem. The product is getting funded on Kickstarter.