How to use heart rate monitoring and zones to boost cycling speed and fitness

Power meters have been part of mainstream cycling for many years now and are widely used by amateurs and professionals alike. They offer precise, objective data and have transformed how riders pace efforts and structure training. However, despite their popularity and sophistication, it’s still important not to neglect the humble heart rate monitor on the bike.

Heart rate remains a valuable, accessible, and informative training tool for cycling, especially when used alongside power rather than replaced by it. Training at different heart rate zones can pay dividends, whatever your level.

Unlike power, heart rate reflects the body’s internal response to exercise, giving insight into fatigue, recovery, hydration, stress, and overall readiness. It can highlight how hard the body is actually working on a given day, not just what number you’re producing at the pedals.

Coach Mark Kleanthous explains the best heart rate training zones for cycling, and the physiological adaptations of each, showing how targeted heart rate–based sessions can support recovery, build endurance, improve efficiency, and improve endurance.

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1. Recovery ride

Intensity: <60% max heart rate (maxHR)
Duration: 10–50mins

Workout:

This should follow a hard day. Cycle on a flat route or a turbo trainer, keeping resistance light and cadence comfortable. It’s essential to keep heart rate below 60% of your max bike HR at all times, even if that means riding slower than usual. The goal is not fitness gain but active recovery, so resist the temptation to push on hills or into headwinds.

Physiological adaptations:

Increasing blood flow to the muscles helps remove waste products such as lactate and metabolic by-products, accelerating recovery. This gentle movement also promotes circulation without adding further stress to the nervous or muscular systems, allowing you to feel fresher for your next quality session.

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2. Easy ride

Intensity: 60–65% maxHR
Duration: 1.5–3hrs

Workout:

Don’t go above 65% of your maxHR, even on climbs. This is a steady, conversational-paced ride that should feel comfortable throughout. You’ll recover quickly after this ride, allowing you to really put the hammer down during your harder sessions. Easy rides form the backbone of endurance training and can be extended as fitness improves.

Physiological adaptations:

This intensity improves fat metabolism by encouraging the body to use fat as a primary fuel source. It also strengthens muscles, tendons, and joints through repeated low-stress movement, helping build durability and reduce injury risk over the long term.

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3. Efficiency ride

Intensity: 65–75% maxHR
Duration: 1–4hrs

Workout:

During your ride, unclip one leg and focus on a full pedal revolution for 1 minute, concentrating on smooth power application through the entire stroke. Repeat on the other leg for 1 minute. Complete up to 20 repetitions each leg during the ride. If it suits, you can complete single-leg cycling on an indoor trainer, where balance and control are easier to manage.

Physiological adaptations:

You improve the ability to use oxygen more effectively by working aerobically while refining movement patterns. Pedalling efficiency and coordination improve, leading to better technique, reduced dead spots in the pedal stroke, and improved overall economy at moderate intensities.

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4. Improve sustained power

Intensity: 75–82% maxHR
Duration: 45mins–2hrs

Workout:

Improve your fitness by increasing ride duration by 5 minutes each week for 15 weeks, progressing from 45 minutes up to 120 minutes. Ideally choose a flat route to avoid downhill sections where you recover unintentionally, as the aim is to maintain continuous pressure on the pedals throughout the ride.

Physiological adaptations:

This zone improves sustainable power output by teaching the body to work efficiently for prolonged periods. Carbohydrate metabolism is enhanced, allowing you to store and use glycogen more effectively, which is crucial for long races and steady efforts such as time trials or breakaways.

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5. Increase threshold

Intensity: 82–89% maxHR
Duration: 30–60mins

Workout:

Ride multiple loops and make sure you complete each loop in a similar time, maintaining consistent effort rather than speed. The ideal session is 3 × 20-minute loops, ridden hard but under control, with minimal recovery between efforts to maintain time spent near threshold.

Physiological adaptations:

This training raises your anaerobic threshold, allowing you to sustain higher intensities before fatigue sets in. As a result, you can ride faster for longer with less reliance on anaerobic energy systems, a key adaptation for racing, climbing, and sustained high-effort riding.

For more bike training tips, check out how to improve your cycling efficiency by focussing on cadence drills.