Runner jogging at a steady pace on a road

Zone 2 Training: What the Research Shows and How to Apply It

30 March 20263 min read By Dushyanta Dushyanta

Zone 2 training exploded into mainstream advice because elite endurance athletes spend roughly 80 percent of their training at low intensity. The logic looked simple. If it works for Tour de France cyclists, it should work for you. A 2025 narrative review in Sports Medicine looked again and reached a sharper conclusion.

Storoschuk and colleagues at Queen's University concluded that for adults training fewer than 6 hours a week, zone 2 alone does not maximise fitness gains. Higher intensities trigger mitochondrial and cardiometabolic adaptations that low-intensity work alone does not fully reach.

Zone 2 is still useful. It is not magic.

150 to 300
Min/week moderate (WHO floor)
60 to 70%
Of max HR is typical zone 2
14
Experts defined consensus zone 2 in 2025

Sources: WHO 2020 Guidelines (PMID 33239350). Sitko et al. IJSPP 2025 (PMID 40010355). Storoschuk et al. Sports Medicine 2025 (PMID 40560504).

What zone 2 actually is

Sitko and 13 sport scientists reached consensus in 2025: zone 2 sits at intensities immediately below the first lactate or ventilatory threshold, where blood lactate stays low and aerobic metabolism dominates. For most adults that lands at about 60 to 70 percent of maximum heart rate, or a pace where you hold a full conversation without gasping. The panel also noted that the expected adaptations "might not be unique to zone 2" and could be induced at slightly higher or lower intensities.

What zone 2 does well

Three benefits hold up across the evidence:

  • Builds the aerobic base, capillary density, and recovery capacity needed to absorb harder work later.
  • Low injury risk and fast next-day recovery, which keeps weekly volume sustainable.
  • Easy to insert into a London day (brisk lunch loop, easy cycle commute, weekend long walk).

Where zone 2 falls short

For training volumes under 6 hours a week (where most working adults sit), zone 2 alone leaves cardiometabolic gains on the table. Higher intensities deliver bigger VO2max improvements, stronger mitochondrial adaptations, and better lactate threshold gains per minute of training. The Sports Medicine review concluded that combining zone 2 with higher-intensity work is the practical recommendation for the general public.

Weekly intensity pyramid for adults training 3 to 5 hours
ZONE 4-5 10 to 20% of weekly time ZONE 3 (TEMPO) 10 to 20% of weekly time ZONE 2 (BASE) 60 to 80% of weekly time

Adapted from polarised and pyramidal training models discussed in Sitko et al. IJSPP. 2025 (PMID 40010355) and Storoschuk et al. Sports Medicine 2025 (PMID 40560504). Volumes shown for general adult fitness, not elite sport.

A practical weekly plan

Day 1, 3, 5
30 to 60 minutes zone 2. Brisk walk, easy cycle, easy jog. Nose breathing should work.
Day 2
Higher intensity: 6 x 2 minutes hard, 2 minutes easy. Or a tempo run for 20 minutes.
Day 4
Strength training. Compound lifts, 45 minutes.
Day 6 or 7
Longer easy session 60 to 90 minutes, or a second strength day.

How to find your zone 2

Use the talk test. If you hold a full sentence without gasping, you are in zone 2. If you need to pause for breath between sentences, you are above it. A chest-strap heart rate monitor is more reliable than a wrist watch for this work. The conversational pace will sit somewhere between 60 and 70 percent of your maximum heart rate for most adults.

Bottom line

Zone 2 is the base layer, not the entire programme. Anchor three easy sessions a week, then add one or two harder sessions and two strength sessions on top. This delivers the cardiometabolic and longevity gains the popular advice promises, with less wasted volume.

Work with DT Fitness London

For a training plan built around your heart rate zones, goals, and schedule, book a consultation at www.dushyantatomar.com.

Dushyanta Tomar, MSc Applied Sports and Exercise Physiology, CIMSPA Accredited Personal Trainer.

Sources

  1. Storoschuk KL, Moran-MacDonald A, Gibala MJ, Gurd BJ. Much Ado About Zone 2: A Narrative Review Assessing the Efficacy of Zone 2 Training for Improving Mitochondrial Capacity and Cardiorespiratory Fitness in the General Population. Sports Med. 2025, vol 55, issue 7, pages 1611 to 1624. PMID 40560504. pubmed.ncbi.nlm.nih.gov/40560504
  2. Sitko S, Artetxe X, Bonnevie-Svendsen M, et al. What Is Zone 2 Training? Experts' Viewpoint on Definition, Training Methods, and Expected Adaptations. Int J Sports Physiol Perform. 2025, vol 20, issue 11, pages 1614 to 1617. PMID 40010355. pubmed.ncbi.nlm.nih.gov/40010355
  3. Bull FC, Al-Ansari SS, Biddle S, et al. World Health Organization 2020 guidelines on physical activity and sedentary behaviour. Br J Sports Med. 2020, vol 54, issue 24, pages 1451 to 1462. PMID 33239350. pubmed.ncbi.nlm.nih.gov/33239350
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