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Pro runners and a physical therapist give their best tips on how to determine how cold is too cold to run outside.

United statesNew yorkUniversity of pennsylvaniaThomas jefferson universityJohn vasudevanNatalie marklandKathy butlerPaige triolaStanford universityPhiladelphia veterans administrationPublic health in madisonUniversity of wisconsin school medicineSports medicine program at pennTeam physicianToo coldRun outside