CrossFitters usually don’t lack engine — they lack running-specific durability.
You can fake fatigue in a lot of movements. You can’t fake it in running.
Once the pattern breaks down, there’s nowhere to hide. Cadence drops, mechanics get ugly, and fatigue piles up fast.
That’s why most athletes don’t need more “hard running.”
They need:
- Better mechanics
- More exposure
- Higher cadence
- Easier aerobic work
- Gradual builds (resiliency)
For most competitive CrossFitters, 3 run sessions per week and 8–12 total miles is enough to dramatically improve running performance — if it’s structured correctly.