Maybe you jog for exercise. Maybe you've run 10Ks or marathons. But you haven't run nearly as far as this Utah man. Despite all odds, Eric Johnson has really gone the distance.

From muscle fibers to mental grit, here’s the science behind why some bodies can endure ultramarathons, while others hit the wall far sooner. Ultramarathons sit at the far edge of what the human body ...

Learn more about the impact ultramarathon running has on red blood cells and how it may do more harm than good for the body.

By Dennis Thompson HealthDay ReporterTHURSDAY, Feb. 19, 2026 (HealthDay News) — Ultra-marathon runners must be incredibly fit to endure races that can extend more than 100 miles, but their bodies pay ...

After a long trail race, some of your red blood cells may not bend the way they should. That matters because red blood cells have a tight job description.

HealthDay News — Ultra-endurance running accelerates red blood cell (RBC) aging through inflammatory and oxidative pathways, according to a study published online Feb. 18 in Blood Red Cells & Iron.

Middle-distance runs on mixed Peak District terrain reveal a shoe that feels purposeful – but not without compromise ...