Strength training is one of the top ways to help your body stay functional and healthy for the long run, Sivan Fagan, C.P.T., owner of Strong With Sivan in Baltimore, tells SELF. “I see the benefit with my 80-year-old clients—strong hips, and being able to control your hips, for instance, is the difference between being able to stop a fall versus not being able to stop yourself, falling, and breaking a hip.”