The "Original" Swim Cords Perfect For Tethered Swimming And Lighter Resistance Strength Aqua-Aerobics As Well As Dry Land Stretching, Aerobics And Rehabilitation Therapy. Dimensions: 4.5 Feet Long, 3/16Th Inch Cord; And Has A Maximum Stretch Length Of 8+ Feet. Swimming With Swim Cords Offers All The Muscle Toning And Cardiovascular Benefits Of Jogging And Aerobics, Without The Constant Pounding On Your Joints. With Swim Cords, You Swim In A Stationary Place Allowing You To Avoid Distractions,: Other People Swimming, Wading Or Playing In The Same Pool, Able You To Concentrate On Proper Stroke And Kick Mechanics Or Relax And Enjoy The Meditation Effects Water Has To Offer. You Can Even Close Your Eyes And Swim!