Groin Strain

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So pretty sure I've strained my groin. Been 3 days so far with no training. Got a doc appt on Friday, but my mother and aunt who are both nurses are pretty sure that's it.

So...anyone have any experiences with how long this will put me out? I'm hoping to run the Baltimore half marathon in October and am about half way in my training. Will this injury kill that hope? Any and all advice is helpful.

Thanks!