It’s a safety thing.
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In 2000 the vault apparatus was changed from the long horse to the modern table due to injuries caused by the previous design. The FIG committee has now decided that the newer table is also too dangerous; this time because of the increased difficulty of the vaults performed. By adopting the mushroom as the new vaulting apparatus, it is ensured that gymnasts will not be able to reach such great heights due to the mushroom's low stature and general lack of stability. This change will limit the difficulty capable of being performed, and therefore reduce injuries in the sport. Follow @longhorsenews for more relevant gymnastics updates.