The Best Chair Replacement: FlexiSpot Sit2Go Fitness Chair Ready to ditch your typical office chair? The FlexiSpot Sit2Go Fitness Chair ($300) is a bike chair with an attachable desk so that you can fully immerse yourself in working out. This ergonomic setup fits people of all heights. Image Source: amazon.com FlexiSpot Sit2Go Fitness Chair $300 from amazon.com Buy Now