Thumbnail :
- Top photo has bad lighting
- Bottom photo has good lighting
- Top photo he is not flexed and no pump
- Bottom photo he is flexed and has a pump
It's bullshit and insignificant (Speaking from the view of myself as a gymcel)
Just stick to your standard forearm barbell curls, if anything. (I don't even work mine out and they're pretty big,they get hit through alot of compound shit regardless)
TL;DR - Won't increase your SMV and is designed to make you buy that bullshit product placement forearm ball tool