Jump to:

Signs a Fatigued Cardiorespiratory System Is Causing You to Slow Down

Signs It’s Tired Legs Making Runs Difficult

How to Avoid Cardio Fatigue

How to Ward off Muscle Fatigue

When Your Fatigue May Actually Be Boredom

During the best runs, you hit your stride and cruise at a sustainable pace on fresh legs for as long as you planned. When fatigue hits, it’s the polar opposite: every step forward feels like a battle.

It would likely help to know exactly what holds you back. Do you have tired legs or are you pushing your cardio system too hard? These are two different types of fatigue , and to improve your run performance, it’s helpful to understand the difference.

We spoke with a certified run coach and an exercise physiologist who explain how to tell whether it’s your legs or your lungs and heart keeping you from feeling good on your runs.…