The Effect of Time on Static Stretch on the Flexibility of the Hamstring Muscles
Bandy, William D. and Jean M. Irion. “The effect of time on static stretch on the flexibility of the hamstring muscles.” Physical therapy 74 9 (1994): 845-50; discussion 850-2 .
References
Only hold a stretch for 30s
Less is worse, more is not better
Claims,
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Source: Bandy-Effect-1994.