A new generation of heavy-duty Xertube Trainer was designed utilizing SPRI's patented braided tubing technology, built specifically for dynamic, high resistance exercise. Two 36" strands of braided tubing are independently connected to a durable nylon loop that can be attached to any sturdy object, help by a training partner, or in a secure door. The Braided Xertube Trainer features SPRI's braided tubing, foam handles, and a newly designed heavy duty connectors specifically designed for the braided tubing.