It’s all in the … arms?
“When your legs start to fatigue, your arms can help keep them moving,” Lovato says. “Speed up your arm swing and you’ll also speed up your leg turnover. Maintain your arms the entire run—whether a 10K or a marathon. Keep your arms bent at slightly less than a 90-degree angle and drive those elbows from your torso backward. Don’t be too worried if your arms cross a little in front of your body, just be sure not to rotate your shoulders.”