In the past few years, we have covered plenty of exercise machines that fit under your desk to help you get more active at work. QuitSit is also worth a look. It is a chair “adapter” for your treadmill that lets you go from sitting to walking in a flash.
Thanks to QuitSit, you can slide your chair back to start walking on your treadmill in a safe fashion. This is designed to adapt to most treadmills on the market. It has max load capacity of 110kg.