If you’re over 50 years old, or heading that way soon, adding resistance training to your running routine can yield major benefits—and a recent research review suggests that’s true for both men and women. The findings, published in the journal Sports Medicine, included the results of 30 different training studies involving 1,400 participants, all age 50 or older. Comparing muscle mass and strength gains, researchers found men and women both had gains, but in different ways. “What’s really important here is the difference between absolute and relative changes,” lead study author Amanda Hagstrom, Ph.D.—a lecturer in the Department of Exercise...