Long runs are really the backbone of endurance training. They’re not about speed or proving how tough you are every week — they’re about showing up, being consistent, and teaching your body (and your mind) what it feels like to be out there for a long time.

When you head out for a long run, a few things are happening:

• Building your aerobic engine. The more time you spend running easy, the better your body gets at using oxygen and burning fat for fuel. That’s what keeps you moving steady, even hours into a race.
  
• Building endurance. Simple, but true — you’re training your body and your brain to handle the grind of being on your feet. That kind of stamina only comes with time and repetition.
  
• Race practice. Long runs are the dress rehearsals. They’re your chance to test pacing, figure out how often you need water or fuel, and deal with the highs and lows before race day.
  

How fast should you run?
Easy. If you can chat with a friend without gasping, you’re in the right zone. Think 60–75% effort — slower than race pace. You should feel like you’re working, but never like you’re in a sprint. The goal is to finish feeling like you could keep going, not like you’ve burned every last match.