:40 AM, MEM< > wrote: Run to Stay Young By GRETCHEN REYNOLDS DECEMBER 3, 201412:01 AMDecember 3, 201412:01 am 416 Comments Photo <imageootjpg> CreditGetty Images <imageoo2.png> PLAYS ED Gretchen Reynolds on the science of fitness. Running may reverse aging in certain ways while walking does not, a notewor