MA14 Spin Trainer How To: •Advanced Fastball Details• . . 💕Yep, make sure you grab those seams—> and YES put it on your little knuckle line as shown to help you pull those seams as your work your spin speed (aka snap!) 💯 . #ma14 #softballgirls #softballpitching #softballpitchers #softballcoach #softballswag