I do not work for Flexsolate or have any promotional ties with the company. This is a fine product that allows you to do what is so difficult to do otherwise: isolate your target muscle.
By removing your hand from the exercise, and thus your wrist and forearm, all your focus can be placed on the target muscle as you exercise, allowing for faster improvements with no extra work or time involved. These straps are especially excellent for back exercises, an area many people have problems developing.
Watch the video to see how they work: