You've probably seen that guy at the gym awkwardly stroking his groin or inner thigh. No, he's not being a creeper. He just pulled a groin muscle and is attempting to look nonchalant, even though he's most likely thinking, "Shit, I hope this isn't serious."
Groin muscles can be tricky. There are multiple reasons for tight groins, but one can be your chronically weak gluteus medius. This causes something called altered reciprocal inhibition or ARI. When one muscle is too weak, the antagonist (the muscle that does the opposite action) becomes too tight.
So, for the groin, the adductors are the antagonists of the gluteus medii. If the glute medius is weak, the adductors tighten up. If the gluteus medii is tight, the adductors become weak.
Stretching your groin can be hard because most lifters are too tight in other areas (hamstrings, hip flexors and thoracic spine) to be able to access many of the groin stretches available. As a result, you can't even "reach" your groin muscles to stretch them in the first place.
Stretching your groin isn't going to fix the problem entirely, but this will certainly help:
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