Kansas City Chiefs safety, Eric Berry, left his NFL career in 2014 to undergo treatment for Hodgkin's lymphoma and returned to the NFL less than a year later. 

The Wall Street Journal reports that his comeback "was made possible through a medical strategy that doctors are marveling about: Due to a change in his chemotherapy regimen, Berry was able to work out and stay in shape while undergoing chemotherapy."

According to Dr. Christopher Flowers, of Winship Cancer Institute of Emory University, who treated Berry, he elected to get all of his chemotherapy treatments through IVs in his arms, rather than the standard PICC line method which requires a catheter and heavy lifting restrictions. 

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