Jason Fitzgerald

Is your heart rate high, even on easy runs? Aerobic Deficiency Syndrome might explain why. Here’s how to fix it.

Instead of passively watching television or staring at a wall in your basement, these are designed to increase engagement.

Top runners have a forward lean because they are fast, not because they try to lean forward. Here’s how to develop your lean effectively.

Still stretching before you run? Stop. Focus on mobility instead, and save stretching for after (only if it feels good).

Hills build endurance, improve top-end speed, and enhance VO2 Max while helping to keep you injury-free.

Don't stretch sore hamstrings. Here’s what you should do instead.