Question: What factors determine how far a gymnast will start from the vault?
About the article "Gymnastics", section "Vault".

Candidate passages:
 Amanar, 6.3 difficulty start value for the vault (downgraded from 6.5 in the 2013 - 2016 Code of Points).
Two and a half twisting Yurchenko (roundoff, backhandspring entry; 2.5 twisting layout). 
Yurchenko style vaults must have a safety collar in place.
Gymnasts who do not use this collar will be judged as an invalid vault.
Every vault is assigned a specific number; this number is displayed on a board or electronic screen before the gymnast begins.
Gymnasts will be penalised if they fail to show the number of their intended vault, though there is no penalty if the vault ends up being different (e.g.
not performing enough twists).
If a female gymnast balks, for example stops in the middle of the runway or breaks their run before touching the springboard, no deductions are taken.
The gymnast is given thirty seconds to return to the end of the runway and make a second attempt at the vault.
If, however, the gymnast touches any portion of the springboard or vault itself, they receive a score of zero and may not make another attempt.
Ekaterina Kramarenko touched the vault and was given a zero during the team final at the 2007 World Championship.
Male gymnasts receive a score of 0 if they do not vault once they start running.
Both male and female gymnasts receive a score of 0 if they fail to land on their feet first.
Receiving spotting assistance from a coach, or not touching the vault table will result in a score of 0.
Vaulting before the judge has signaled the gymnast can vault once also resulted in a score of 0; this deduction has since been removed.
An example of this would be at the 2008 Summer Olympic Games to Anna Pavlova during the Vault event final on her second vault. 
Yurchenko is the name of both a specific vault and a vault family in artistic gymnastics.
The Yurchenko was named after Soviet gymnast Natalia Yurchenko, who originated the vault in the early 1980s.
In a Yurchenko vault, the gymnast does a round-off onto the springboard and a back handspring onto the horse or vaulting table.
The gymnast then performs a salto, which may range in difficulty from a simple single tuck to a triple twist layout. 
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Alexis Amber "Lexie" Priessman (born January 23, 1997) in Cincinnati, Ohio is a senior international elite artistic gymnast.
She was the 2011 U.S. junior national champion on vault and the 2012 U.S. junior national all-around and floor champion.
Priessmann competes the Amanar vault, which has a 6.3 start value.