Runners need strong hamstrings for two reasons:
to avoid injury &
to become healthier stronger, & even faster athletes.
Like most muscles used in running,
the hamstrings work both as they stretch/lengthen and as they contract.
The hamstrings lengthen as the foot swings forward before striking the ground.
(This is the position when most of hamstring injuries happen while running or sprinting.)
Then it contracts from stance to push/toe off phase.
Do 12-15 reps of these 3 exercises:
Straight leg elevated bridge
Bridge with knee drive
Single leg elevated bridge
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