Trainers share their favorite ways to loosen up.

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If you stretch your hamstrings constantly but they still feel like guitar strings ready to snap, you’re not imagining it. And stretching alone may be part of the problem. The real culprits are usually ...

You’ll know the feeling if you have tight hamstrings – your strides feel shorter, it seems like you’re working harder than usual and your legs feel stiff and restricted. Going faster or tackling hills ...