Jillian Michaels Ultimate Level 3 Resistance Cord for $5.81

Perform an intense muscle workout without buying bulky dumbbells or barbells with the Jillian Michaels "level three" resistance cord. The cord adjusts easily to different lengths, so you can perform everything from bicep curls to wide-grip pulldowns to shoulder flies. The cord's ergonomic handles, meanwhile, are soft and comfortable--no hand cramps or chafing with these grips.