Running Training Pace Zones Explained

Running every session at the same “medium-hard” effort is the most common way to plateau. Structured training uses pace zones — different speeds for different purposes — so that easy days are truly easy and hard days are genuinely hard.

The five training paces

• Easy — conversational, the bulk of your weekly mileage; builds aerobic base and aids recovery.
• Marathon — comfortably hard, the pace you could hold for a marathon.
• Threshold — “comfortably uncomfortable,” around the effort you could sustain for about an hour; improves your lactate threshold.
• Interval — hard, roughly 3–5 minute repeats; develops your VO₂ max.
• Repetition — very fast, short reps with full recovery; sharpens speed and running economy.

The 80/20 idea

A well-known guideline is that around 80% of your running should be easy, with only about 20% at threshold pace or faster. Most runners do too much of their easy running too fast, which blunts recovery and leaves them flat for the sessions that actually drive improvement. Slowing the easy days down is often the single biggest win.

Anchored to one number

All five zones can be derived from a single reference — your current threshold pace. Easy pace is a set amount slower; interval and repetition paces are faster. That's why you only need to know one honest, recent benchmark to set your whole range.

Find your threshold pace

A good proxy is roughly the pace you could race for an hour — close to a recent 10K to 15K race pace for many runners. Not sure of your current pace? Work it out from a recent run with the pace calculator.

Set your zones

Enter your threshold pace into the training pace zones calculator and it returns easy, marathon, threshold, interval and repetition ranges — so every run has a clear target.