The forearm is often less emphasized in workouts, specially if you're doing them at home. This effectively engages the forearm's brachiordialis for a complete workout. It also helped me develop some forearm strength on my journey to doing pullups. It's easy to use & grasp too, great for beginners.
This product bent sideways in single usage! And it has no return policy. Please stay away from seller eErlik Official, put in a few more bucks and get a quality product. I wasted my Rs.350, don't make the same mistake as me.