What is the long run?
The long run is the single most important session in any endurance program. Run in Z1 to low Z2, around 65 to 75 percent of max heart rate, for 75 to 150 minutes. The goal isn't speed, it's duration. This is where you build mitochondrial density, capillary networks, fat oxidation, and the mental toughness to keep moving when you'd rather stop. Skip the long run and the rest of your training has no foundation. Done right, you finish tired but not destroyed.
How to do the long run
- 1
Set the pace by feel
Should feel embarrassingly easy in the first 20 minutes. If you can't hold a full conversation, you're too fast. Slow down.
- 2
Lock in the cadence
Aim for 170 to 180 steps per minute. Short, light contacts reduce impact across two hours of running.
- 3
Fuel after the 60-minute mark
Anything over 90 minutes needs carbs en route. 30 to 60 g per hour: gel, banana, sports drink. Train the gut, not just the legs.
- 4
Finish controlled, not crawling
If the last 20 minutes turn into a death march, the run was too long or too fast. Next week, scale back five percent.
Pro tip
Use a heart-rate cap, not a pace target. If HR drifts above Z2, walk for 60 seconds and restart. Discipline here pays off on race day.
Common mistakes
Running too fast.
The classic error. Z3 long runs build fatigue without the aerobic adaptations. Slower is the gain.
Skipping fuel.
You bonk at 75 minutes and the last hour becomes useless. Pre-empt with carbs every 30 minutes.
Same route every week.
Boredom kills consistency. Rotate three or four routes including one with hills.
Stacking it after a hard session.
Place the long run after an easy day. Compromised legs deliver compromised aerobic work.
Variations and progressions
Easier
60 min Z2 walk-run
Run 4 min, walk 1 min, repeat. Builds the aerobic base without overload for new runners.
Harder
Progression long run
120 minutes: first hour Z2, then 30 min mid-Z2, finish with 20 min at marathon pace. Brutal but race-specific.
Joint issues?
Z2 bike or row
Two hours of low-intensity cycling or rowing gives 80 percent of the aerobic benefit at a fraction of the impact.
How to program it
Three protocols by goal. Pick one per cycle and aim for progression on load or distance.
| Goal | Sets × distance | Load | Rest |
|---|---|---|---|
| Aerobic base | 75 min | Z2 | Easy day after |
| Marathon prep | 150 min | Z1-Z2 | 48h easy |
| Hyrox endurance | 90-100 min | Z2 with strides | Easy day after |
Long Run FAQ
How long should my long run actually be?
Roughly 25 to 30 percent of your weekly running volume, capped at 150 minutes. Beyond that, the cost in recovery outweighs the aerobic gain. For most Hyrox or 10K athletes, 75 to 100 minutes weekly is the sweet spot.
Should I run the long run fasted?
Occasionally yes, for fat adaptation. But never on your longest run of the cycle. Fasted training under 75 minutes is fine. Above that, you risk a low-quality session and slow recovery. Save the practice for shorter mid-week aerobic runs.
Why am I so slow in Z2?
Because your aerobic base is undertrained. Most recreational athletes need three to six months of consistent Z2 work to see pace climb at the same heart rate. The slow patient phase is exactly the work. Trust it and your race pace will rise with it.
