Olympic Vault finalist Ellie Black had problems vaulting at Canadian Championships.
Coach David Kikuchi wondered if the spring board was slipping forward as she punched.
To check, they carried over a package of heavy shingles to BLOCK the board from moving forward.
Ellie did vault well in that training session.
The shingles, by the way, were being used as weights for the free standing equipment.
Gymnastics Coaching.com 