The Best Workouts to Build Endurance — Backed by Science 🏃‍♂️💨

Endurance. It's the ability to keep going when your body is screaming at you to stop. It's what separates the person who finishes the race from the one who drops out at mile 10. And the good news? It's completely trainable — no matter where you're starting from.

But not all workouts build endurance equally. The science is clear on which methods work, which work best, and how to combine them for maximum results.

Let's get into it.

Endurance training comes down to one key measurement: VO2max — your body's maximum capacity to take in and use oxygen during exercise.

Kodama et al. (2009) demonstrated in a landmark meta-analysis published in JAMA that every 1-MET increase in cardiorespiratory fitness is associated with a 13–15% reduction in all-cause mortality. Meanwhile, a 46-year longitudinal study by Nes et al. (2019), found that each single unit increase in VO2max was associated with an additional 45 days of life expectancy — 

The higher your VO2max, the longer and harder you can go — and the longer and healthier your life is likely to be.

1. Zone 2 Training — The Foundation of All Endurance 🐢

Zone 2 — also known as Long Slow Distance (LSD) — is low to moderate intensity exercise performed for an extended period. A comfortable jog, a steady bike ride, a long swim at conversational pace. It might not feel like hard work, but the adaptations it triggers are extraordinary.

Midgley, McNaughton and Jones (2006), identified that sustained aerobic base training drives improved cardiovascular efficiency, increased mitochondrial density, enhanced fat oxidation, and greater oxygen-carrying capacity within skeletal muscle. Your heart gets more efficient, your muscles get better at using oxygen, and your body learns to burn fat instead of rapidly depleting carbohydrate stores.

Seiler and Tønnessen (2009), found that marathon runners and Tour de France cyclists spent approximately 80% of their training time at Zone 2 intensity, with only 20% at higher efforts. Seiler (2010) suggests that three to six hours of Zone 2 per week is highly effective for recreational athletes, in sessions of 45–90 minutes.

Best Zone 2 activities: Easy running, steady cycling, swimming, rowing, brisk walking

Bottom line: Zone 2 is the aerobic foundation everything else is built on.

2. HIIT — The Fast Track to a Bigger Engine ⚡

Short bursts of all-out effort followed by brief recovery — and the science behind it for endurance is staggering.

A study by Sporiš and Weston (2015), with 28 controlled trials across 723 participants, concluded that both endurance training and HIIT elicit large improvements in VO2max, with the gains following HIIT being greater than those following traditional endurance training. A randomised controlled trial by Helgerud et al. (2007), also found that a 4x4 minute interval protocol at 85–95% maximum heart rate produced a 7.2% improvement in VO2max in just eight weeks in comparison to groups performing the same total work at lower intensities.

Best HIIT protocols:

• 4x4 minutes at 85–95% max heart rate, 3-minute recovery (Helgerud et al., 2007)

• Tabata — 20 seconds on, 10 seconds off, 8 rounds

• 30/30 intervals — 30 seconds hard, 30 seconds easy, repeated 10–15 times

Bottom line: Use HIIT 1–2 times per week alongside Zone 2 — not instead of it.

3. Tempo Running (Lactate Threshold Training) — Running Faster for Longer 🏃

Tempo runs are performed at your lactate threshold — the intensity at which lactic acid accumulates faster than your body can clear it. Training here pushes that threshold higher, allowing you to sustain faster speeds for longer before fatigue kicks in.

Subbarayalu et al. (2024), confirmed that lactate threshold training improves endurance through enhancing muscle lactate utilisation, allowing athletes to sustain higher intensities for longer periods without experiencing excessive fatigue. Faude, Kindermann and Meyer (2009), further confirmed that lactate threshold markers show strong linear correlations with race performance across running and cycling events.

Best tempo workouts:

• Continuous tempo run — 20–40 minutes at "comfortably hard" pace

• Tempo intervals — 4x10 minutes at threshold with 2-minute jog recovery

• Fartlek runs — unstructured mix of easy and hard efforts over 30–60 minutes

Bottom line: One tempo session per week will measurably lift your race pace.

4. Cycling — Low Impact, High Returns 🚴

Cycling is one of the most effective and joint-friendly methods of building endurance available. Oja et al. (2011), found regular cycling is associated with significant improvements in VO2max and metabolic health, while placing substantially lower mechanical stress on the joints compared to running. Thus making it ideal both as a primary training tool and for cross-training.

Research by Millet et al. (2002), confirmed that combining cycling and running produces superior endurance adaptations to single-modality training, particularly for VO2max and exercise economy.

Best cycling workouts: Zone 2 steady rides (60–120 mins), 4x4 HIIT on the bike, hill repeats, 30-minute tempo efforts.

Bottom line: Cycling builds a powerful aerobic base with minimal injury risk.

5. Rowing — The Full-Body Endurance Machine 🚣

While running trains the lower body and cycling targets the legs, rowing engages the upper body, lower body, and core simultaneously while placing exceptional demands on the cardiovascular system.

Hagerman et al. (1996), demonstrated that elite rowers consistently exhibit among the highest VO2max values of any endurance sport. For recreational athletes, this reflects the fact that rowing activates approximately 86% of the body's muscle mass per stroke (Secher, 1993) — making a 30-minute rowing session one of the most metabolically demanding and time-efficient workouts available.

Best rowing workouts: 20–30 minute Zone 2 steady state, 500m hard intervals, 4x4 HIIT on the rowing machine.

Bottom line: For full-body endurance that builds cardiovascular fitness and muscular stamina simultaneously — get on a rowing machine.

6. Strength Training — The Endurance Booster Most People Ignore 🏋️

Lifting weights makes you a better endurance athlete. Balsalobre-Fernández, Santos-Concejero and Grivas (2016), analysed 699 research articles and found that strength training can improve running economy, with the magnitude of its effect depending on the strength training method and the speed at which running economy is assessed. 

Research by Millet et al. (2002) found a 6.9% improvement in running economy in well-trained triathletes after just 14 weeks of twice-weekly strength training, attributed to improvements in neuromuscular efficiency and tendon stiffness, reducing the metabolic cost of each stride. Abt et al. (2022), further confirmed that combining strength and endurance training produced superior performance improvements and injury prevention compared to endurance training alone.

Best exercises for endurance athletes: Squats, lunges, deadlifts, single-leg work, core stability exercises

Bottom line: Strength training makes every other endurance workout more effective and keeps you injury-free.

How to Put It All Together

Research by Stöggl and Sperlich (2014), found that a polarised approach — the majority of training at Zone 2 with a minority at high intensity — produced superior VO2max improvements compared to any single-method approach.

A simple weekly structure:

• Monday — Zone 2 run or cycle (45–60 mins)

• Tuesday — Strength training

• Wednesday — HIIT (running, cycling, or rowing)

• Thursday — Rest or active recovery

• Friday — Tempo session (30–40 mins)

• Saturday — Long Zone 2 effort (60–90 mins)

• Sunday — Complete rest

The Bottom Line

Zone 2 builds your base. HIIT raises your ceiling. Tempo lifts your race pace. Strength keeps you healthy. As Nes et al. (2019) showed across 46 years of data, every unit improvement in cardiorespiratory fitness adds measurable years to your life. Training your endurance isn't just about performance, it's about living longer and living better.

Start where you are. Be consistent. Go further.

References

Abt, G., et al. (2022) 'Concurrent endurance and strength training for recreational runners', International Journal of Environmental Research and Public Health, 19(17), p. 10773.

Balsalobre-Fernández, C., Santos-Concejero, J. and Grivas, G.V. (2016) 'Effects of strength training on running economy in highly trained runners: a systematic review with meta-analysis', Journal of Strength and Conditioning Research, 30(8), pp. 2361–2368.

Faude, O., Kindermann, W. and Meyer, T. (2009) 'Lactate threshold concepts: how valid are they?', Sports Medicine, 39(6), pp. 469–490.

Hagerman, F.C., et al. (1996) 'Aerobic and anaerobic responses to exercise in elite oarsmen', Journal of Strength and Conditioning Research, 10(1), pp. 17–23.

Helgerud, J., et al. (2007) 'Aerobic high-intensity intervals improve VO2max more than moderate training', Medicine and Science in Sports and Exercise, 39(4), pp. 665–671.

Kodama, S., et al. (2009) 'Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events in healthy men and women: a meta-analysis', JAMA, 301(19), pp. 2024–2035.

Midgley, A.W., McNaughton, L.R. and Jones, A.M. (2006) 'Training to enhance the physiological determinants of long-distance running performance', Sports Medicine, 37(10), pp. 857–880.

Milanović, Z., Sporiš, G. and Weston, M. (2015) 'Effectiveness of high-intensity interval training and continuous endurance training for VO2max improvements: a systematic review and meta-analysis', Sports Medicine, 45(10), pp. 1469–1481.

Millet, G.P., et al. (2002) 'Effects of concurrent endurance and strength training on running economy and VO2 kinetics', Medicine and Science in Sports and Exercise, 34(8), pp. 1351–1359.

Nes, B.M., et al. (2019) 'Midlife cardiorespiratory fitness and the long-term risk of mortality: 46 years of follow-up', Journal of the American College of Cardiology, 72(9), pp. 987–995.

Oja, P., et al. (2011) 'Health benefits of cycling: a systematic review', Scandinavian Journal of Medicine and Science in Sports, 21(4), pp. 496–509.

Secher, N.H. (1993) 'Physiological and biomechanical aspects of rowing', Sports Medicine, 15(1), pp. 24–42.

Seiler, S. (2010) 'What is best practice for training intensity and duration distribution in endurance athletes?', International Journal of Sports Physiology and Performance, 5(3), pp. 276–291.

Seiler, S. and Tønnessen, E. (2009) 'Intervals, thresholds, and long slow distance: the role of intensity and duration in endurance training', NSCA Performance Training Journal, 8(5), pp. 1–12.

Stöggl, T. and Sperlich, B. (2014) 'Polarized training has greater impact on key endurance variables than threshold, high intensity, or high-volume training', Frontiers in Physiology, 5, p. 33.

Subbarayalu, A.V., et al. (2024) 'Lactate threshold training to improve long-distance running performance: a narrative review', Montenegrin Journal of Sports Science and Medicine, 13(1), pp. 19–29.