Different workout styles can get you equally fit, but they affect your body differently—which suggests that you should mix it up
Nutritionist Scott Tindal does a deep dive on bonking, glycogen stores, and the train low diet.
Stair sprints build leg strength and increase VO2 max.
Speed work will raise your aerobic capacity; but to improve performance, you need every piece of the fitness puzzle.
Here's exactly what it means and how important it is.
Not sure if you're getting faster? Get on the treadmill to find out.