Expand your workout options with this lightweight cord for your AeroPilates(R) Reformer. It's 40% lighter than the standard cord and helps to strengthen core muscles. In fact, many of the exercises done on the Reformer can be more challenging when you have less resistance. From Stamina Products. As always, please consult your personal physician before beginning any diet or exercise program. Take a realistic approach: If you work consistently and follow the program, you maximize your results.