We all notice things in the mirror as we age: wrinkles, thinning hair, or skin that isn’t as elastic as it used to be. But if you’re a physical therapist, one of the best ways to tell whether someone is aging well isn’t to look at their appearance, but to test the strength of their backside—specifically, their glutes, a group of muscles located at the back of the pelvic region.

“As more people pursue strategies for healthy aging, they are discovering the importance of glute strength. These muscles that form your backside do much more than just look nice,” Antonia Chen, M.D., M.B.A., writes on UT Southwestern Medical Center’s site. “They are the primary stabilizers of your entire body. All of your muscle movements from........

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