مشاهده ویدیوی آموزشی: https://www.youtube.com/watch?v=rj3Yu2IUAaY&feature=emb_title
The WHH1 is a shoulder and arm strength trainer. This 1 Kilo ball (2.2 lbs) builds the core muscles along with forearm and hand. It is great for any athlete trying to generate more strength and arm speed. It is made of a durable cover which can handle being thrown against a wall repeatedly. 1-Year Warranty