“After the birth of my second child, my sister challenged me to do a half-marathon with her,” says Amy Johnson, 33, (Left) of Mahomet, Illinois, about her sister Abby Prince, 32, (Right) of Mansfield, Illinois.

“I thought there was no way—I had never run! But she kept pushing me and stayed with me during the race. I had tears in my eyes as I crossed the finish line.”

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