Tempo runs improve speed by training your body to clear lactate as efficiently as it produces it, allowing you to sustain faster paces for longer periods. Think of them as the sweet spot between a relaxed jog and an all-out sprint—challenging enough to create real change, but not so hard that you’re wiped out for days.
What I love about tempo runs is how adaptable they are. Whether you’re chasing a parkrun PB or getting ready for your first marathon, learning how to do these sessions right can be the difference between hitting your goals and just missing out. I’ll break down what makes tempo runs so effective and share how to work them into your training for the best results.
What Are Tempo Runs and How Do They Improve Speed?
Tempo runs work at your lactate threshold to boost speed endurance and race performance. The “comfortably hard” effort trains your body to clear lactate efficiently whilst building mental toughness for racing.
Defining Tempo Runs and the Comfortably Hard Effort
A tempo run is a sustained effort at what I call “comfortably hard” intensity. This isn’t just a vague feeling—it’s an actual physiological zone.
The effort should feel tough but manageable. You’re working hard enough that talking is tricky, but not so hard that you’re gasping or desperate for a break.
Key characteristics of tempo effort:
- Breathing is steady but definitely heavier
- You feel in control of the pace
- The effort can be kept up for 20-60 minutes
- It feels “pleasantly uncomfortable”
Jack Daniels, who wrote Daniels’ Running Formula, says tempo pace is about 25-30 seconds per mile slower than your 5K race pace. For heart rate fans, that’s usually 86-90% of your max heart rate.
I find tempo runs mentally tough because you have to resist the urge to speed up or back off. It’s a great way to practise pacing for race day.
Lactate Threshold, Anaerobic Threshold, and the Science Behind Speed
Your lactate threshold is the fastest pace you can hold while clearing lactate as quickly as your muscles make it. This is where tempo runs work their magic.
During tempo efforts, your muscles churn out lactate as they burn glucose for energy. At threshold pace, your body manages to process this lactate, so you avoid that rapid, burning fatigue you get at faster speeds.
What happens at lactate threshold:
- Lactate production equals lactate clearance
- Blood lactate levels steady around 4 mmol/L
- You can hold this effort for a good chunk of time
- Oxygen keeps flowing to working muscles just fine
The anaerobic threshold is about the same intensity. Training here helps your body buffer acid, move lactate around, and keep going at higher speeds before fatigue wins.
Regular tempo training bumps up your lactate threshold pace. Basically, you can run faster before hitting that dreaded “redline.”
Key Differences: Tempo Runs Versus Threshold Runs
People often swap “tempo” and “threshold” like they’re the same, but there are a few differences.
Tempo runs usually mean a steady effort of 20-40 minutes at threshold pace, done continuously with a warm-up and cool-down.
Threshold runs is a broader term. It covers any workout at lactate threshold intensity, including tempo runs, cruise intervals, and other variations.
| Workout Type | Duration | Structure | Recovery |
|---|---|---|---|
| Classic Tempo | 20-40 min | Continuous | None during effort |
| Cruise Intervals | 3-8 min segments | Broken up | 30-90 seconds |
| Threshold Tempo | 15-60 min | Varies | Depends on format |
I like cruise intervals for beginners—the short breaks make the workout less intimidating but still give you the same benefits.
The Link Between Tempo Pace, Race Pace, and Speed Training
Tempo pace is closely tied to your racing ability, especially for distances from 10K up. Knowing how these relate helps you train smarter.
Your lactate threshold pace is about the same as your one-hour race pace. For most, that’s somewhere between 15K and half marathon pace, depending on fitness.
Pace relationships:
- 5K race pace: 25-30 seconds faster than tempo pace
- 10K race pace: 15-20 seconds faster than tempo pace
- Half marathon pace: Very close to tempo pace
- Marathon pace: 10-20 seconds slower than tempo pace
Distance runners get the most out of tempo training since those races are run near threshold intensity. The gains transfer directly to race day.
For 5K and 10K prep, I use tempo runs less often, leaning more on shorter intervals. Still, tempo work is key for building the aerobic base you need for speed and racing.
Tempo runs also teach you to judge pace. Practising your goal race effort helps you run more efficiently and not obsess over your GPS mid-race.
Integrating Tempo Runs Into Training for Maximum Results
Adding tempo runs to your training plan takes some thought—timing, pacing, and workout design matter. I suggest balancing these steady efforts with your easy runs and intervals, and matching the intensity to your race goals.
Benefits: Endurance, Speed, and Mental Toughness
Tempo running gives you three huge boosts for racing. Your body gets better at clearing lactic acid, so that burning feeling in your legs shows up later in races.
Running economy also improves a lot. I’ve seen runners cut their oxygen use at race pace by 3-5% after a couple months of steady tempo work.
The mental toughness side is just as important. Holding a “comfortably hard” effort for 20-40 minutes teaches you to stick with discomfort and not freak out.
Endurance benefits include:
- Higher lactate threshold
- Better fat burning at faster speeds
- More capillaries in your muscles
Speed improvements come from teaching your body to hold faster paces. After weeks of tempo training at 15-30 seconds per mile faster than marathon pace, your goal pace will feel a lot easier.
How Tempo Sessions Fit with Easy Runs, Long Runs, and Intervals
I see tempo sessions as the “medium-hard” effort between easy runs and tough interval training. I usually schedule tempo runs on Tuesdays or Wednesdays, leaving 48 hours after the weekend long run.
Weekly structure example:
- Monday: Easy run or rest
- Tuesday: Tempo run workout
- Wednesday: Easy run
- Thursday: Interval workouts (800m repeats, etc.)
- Friday: Easy run or rest
- Saturday: Easy run
- Sunday: Long runs
Keep about 80% of your miles at an easy pace. Tempo runs should make up 8-12% of your weekly distance. Easy runs the day after tempo sessions help you recover by boosting blood flow.
Try not to stack tempo runs right before interval training or right after a long run. Your legs need a bit of breathing room between hard sessions.
Tips for Marathon and Middle-Distance Training Programmes
Marathon training calls for longer tempo efforts, starting at about 20 minutes and working up to 45-60 minutes. Personally, I like to schedule two tempo sessions every three weeks during base building, then bump it up to weekly as peak training approaches.
For advanced marathoners, tossing some tempo miles into your long run is a game-changer. For example, try 18 miles with the middle 8-10 miles at tempo effort. It’s tough, but it really helps you get a feel for race pacing when you’re already tired.
Middle-distance runners (5K-10K) do better with shorter, sharper tempo sessions—think 12-20 minutes at the quicker end of tempo. I’d recommend one tempo run a week, mixing it in with your usual track speed workouts.
Recovery between tempo sessions is huge. I always insist on at least 48 hours of easy running before another hard effort. If you jump back in too soon, injuries and sloppy workouts are almost guaranteed.
Keep an eye on your response to tempo training—resting heart rate, maybe, or how your training paces feel. If you’re consistent, you’ll probably see your threshold pace drop by 5-15 seconds per mile over a couple of months. That’s pretty satisfying, isn’t it?
