Stretching is as important as exercise for building muscle, but maybe you don't know which stretches to do. These are the best stretches for every body part.
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How to properly stretch your hip flexors in 3 moves - Thrive Now Physiotherapy
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Best Stretches for Every Muscle, From Back & Shoulder to Hip Flexor Stretches - Thrillist
The Best Hip Flexor Stretches for Tight Hips
The 24 Best Stretching Exercises for Better Flexibility
12 Best Hip Flexor Stretches to Reduce Back and Hip Pain