BOWSWIM® 188 Blue Resistance Swimming System Set - Bowswim’s Resistance Swimming System is a flexible, tethered swimming device designed to mimic open water swimming. This system eliminates the need for pool flip turns and allows for long distance swimming in a pool. It also provides resistance giving you twice the swim in half the time. With the clamp, the user can take the system to any pool and attach it to a pool ladder or handrail.