Runners—if you only have time to do one strength workout a week, do this, says a certified trainer and ultramarathon runner

A woman stands holding dumbbells at her shoulders. She is stepping back with her right leg and exercising on a mat with a water bottle nearby.

Running is a full-body workout.

Yes, it involves lots of time on your feet, but to maintain an efficient posture mile after mile, you need to build endurance in your trunk and upper body as much as your legs.