- Jul 10, 2011
- 77
- 6
DD's high school coach started implementing concentration grids at the end of their practice sessions. I've read that Roy Halladay used them all the time. Does anyone have any experience with these? Would love to hear some feedback.
https://www.youtube.com/watch?v=WIk4OHrVwTM
https://www.youtube.com/watch?v=WIk4OHrVwTM