Alex Hutchinson is a National Magazine Award-winning journalist and Outside’s Sweat Science columnist, covering the latest research on endurance and outdoor sports. If you haven’t rewatched the epic ...

HIIT, or high-intensity interval training, is increasingly popular, and it provides plenty of benefits, from torching calories to increasing your VO2 max and overall athletic performance. SIT, or ...

Sprinting builds muscle mass and strength, can increase your speed, and help tone muscles. Long-distance running may improve your cardiovascular endurance and respiratory system. Which is best depends ...

There's a good reason why the military and law enforcement are now testing speed and agility. The ability to run fast without injury requires practice and a steady dose of maintenance work. Whether it ...

Whether you live for speed work or dread running faster than easy pace, sprints offer benefits for most any training program—including long-distance events like half and full marathons. Not only can ...