Just interested how many of us use reflex balls and whether we buy them or make them ourselves. For me, I made my own so it virtually cost me $0. With that being said, I feel the reflex ball has helped more so with accuracy and focus. I usually do it after a workout for 3 rounds with no breaks so it helps me keep focused in a tired cognitive state. Would love to know what you guys have made, bought, and do as a routine since the reflex ball is becoming popular.