This fitness coach explains the proper wrist rolling technique to get a proper forearm workout. Too many people hold their arms out directly in front of them when wrist rolling because of all the Photoshop’d images that Amazon sellers use to advertise their products, which are wrong. You could do it that way but you will be working out your shoulders.
Check out the video and learn the proper technique so that you understand why a you need a good wrist roller like the Q Pro Wrist Roller.