Definition of «tight hamstrings»

"Tight hamstrings" refers to when the muscles at the back of your thighs are stiff or not flexible enough.

Ever see someone with tight hamstrings try and touch their toes? (schoolofcalisthenics.com)
If your pelvis tips back and you aren't at a right angle because of tight hamstrings, put a folded blanket under your hips. (yogajournal.com)
Also, be sure to stretch tight hamstrings, glutes and calves on the regular. (dailyburn.com)
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