The Best Machine With a Chair Holder: JFit Under Desk Elliptical The JFit Under Desk Elliptical ($122) has a chair holder on it so that it can be attached to a rolling office chair to prevent slipping. It is also a quiet machine that records time, distance, speed, and calories burned. If you already have a rolling chair in your office, this might be the under-desk machine for you! Image Source: amazon.com JFit Under Desk Elliptical $122 from amazon.com Buy Now