These gentle sitting exercises will help improve your mobility and prevent falls, and can even be done at home. Get into the proper position by sitting with your legs shoulder-width apart and your knees bent over the edge of your chair. It is almost like a wall sits position, but you are in your chair. Rotate as far to the left as you can and hold for five seconds, then repeat on the right. Leg planks strengthen those beautiful legs while sitting at your desk. Build up slowly and aim to gradually increase the repetitions of each exercise over time.