Tempo and interval sessions: split “fast” into repeatable work

Three session types are not three pace numbers

Training articles often divide running into easy, tempo and interval work, but the pace attached to each label differs between runners. A pace that feels easy for one person may already be hard for another. Instead of copying a pace table, use the talk test and rating of perceived exertion (RPE) to check the day's effort: easy running allows full sentences; tempo running allows only short phrases; intervals make speech difficult by the end of a rep, but recovery should let you start the next one.

Pace still matters, but it should come from your own tests and records, not from someone else's plan.

Easy running remains the base

Quality sessions do not replace easy running. Most training frameworks place the majority of time at low intensity and reserve a small amount for quality work; the exact distribution depends on the goal, experience and recovery. If every run becomes “a little faster”, easy runs stop doing their recovery job and quality sessions suffer from accumulated fatigue.

For a new runner, one quality session a week is often enough; more experienced runners may use one or two, with an easy day or rest between them. Packing quality sessions too closely together is a common way to look busy while failing to adapt.

Tempo: sustained “comfortably hard” running

Tempo usually means a sustained block between easy effort and race pace. Definitions vary between coaches, so do not treat the name as a precise physiological boundary. A practical standard is: breathing is clearly faster but short phrases are possible; form stays stable without sprinting; the session feels challenging but leaves you able to run normally the next day.

An entry template is 3 × 8 minutes at tempo with 2 minutes easy between reps; extend the total time only after the session is repeatable. Treat it as training, not a race. If the last minutes require gritting your teeth, the start was too fast or the day was not suitable.

Intervals: fast reps with enough recovery

Intervals alternate faster work with recovery. The aim is not to make every rep an all-out effort, but to keep form and the intended intensity, then be ready to start again after recovery. A common entry format is 6 × 3 minutes fast with 2 minutes easy; shorter 1-minute reps are also possible with an adjusted total.

“Fast” does not mean “desperate”. End the session if form changes, breathing does not settle during recovery, or the last reps slow sharply. Interval work concentrates load; it is a poor fit for a day with poor sleep, pain or recent illness.

Fitting the sessions into a week

Decide how many runs you can repeat each week, then place quality work inside that structure. Do not schedule tempo and intervals back-to-back; use easy running or rest around them. Heat, humidity and altitude raise the cost of a given pace, so use breathing and effort before forcing the original number.

Record rep times, RPE, breathing and how you felt afterwards. If the same session keeps getting harder, or easy runs also stop feeling easy, check sleep, energy intake and total load before adding more work.

Scope and limits

This page does not prescribe an individual training plan, exact paces or a performance guarantee. Pain, persistent fatigue, previous injury, or heart and breathing symptoms deserve assessment by a qualified coach, clinician or sports professional. Do not use “one more rep” to override an abnormal signal.

Sources and scope

Intensity judgement follows the CDC talk test; the limits of running-load and injury evidence follow a systematic review. Tempo and interval paces, rep counts and recovery vary by person and goal; this page provides a session framework, not a universal prescription.