Cycling Power Zones Explained
If you have a power meter on your bike, you have access to the most precise training tool in endurance sport. But raw wattage numbers mean nothing without context — and that context is power zones.
Power zones turn a single number (your FTP) into a complete training framework. Each zone targets a different energy system, and knowing which zone you are in determines whether you are building endurance, raising your threshold, or sharpening your sprint.
What Is FTP?
Functional Threshold Power (FTP) is the highest average power you can sustain for roughly one hour. It represents the boundary between efforts you can maintain and efforts that force you to slow down.
Everything in power-based training revolves around this number. Your zones, your interval targets, your race pacing — all derived from FTP.
Quick FTP test
Ride as hard as you can sustain for 20 minutes. Multiply your average power by 0.95. That is your estimated FTP. If you don't have a power meter yet, you can use our FTP estimator based on your weight and experience level.
The 7 Coggan Power Zones
Dr. Andrew Coggan's model divides effort into seven zones based on a percentage of your FTP. Here is what each zone does and when to use it.
Very easy spinning. Used for recovery rides and warm-ups. You should be able to hold a full conversation. These rides promote blood flow without adding training stress.
The foundation of all cycling fitness. Zone 2 builds your aerobic base, improves fat metabolism, and increases mitochondrial density. Most of your weekly volume should be here — even for advanced riders. Typical sessions: 90 minutes to 4+ hours.
A steady, moderate effort. Harder than endurance but sustainable for long periods. Tempo work improves muscular endurance and is useful for building strength on longer climbs. You can talk, but only in short sentences.
This is where your FTP lives. Intervals at threshold are the most efficient way to raise your FTP. Typical session: 2×20 minutes at threshold with 5 minutes recovery. Hard but sustainable — you should finish feeling like you could do one more minute, but not five.
Short, intense efforts that push your maximum oxygen uptake. Intervals are 3 to 8 minutes long and feel genuinely hard. VO2max work separates riders who can follow attacks from those who get dropped. Typical session: 5×4 minutes at 110% FTP.
Very short, very intense. Efforts of 30 seconds to 2 minutes that burn through your anaerobic reserves. Used for attacks, short climbs, and bridging gaps. Painful and requiring full recovery between repetitions.
All-out sprints lasting 5 to 15 seconds. Pure peak power. Sprinting, jump starts, and the final kick to the line. Zone 7 is about neuromuscular recruitment — teaching your body to fire every available muscle fibre simultaneously.
How to Use Zones in Your Training
The key principle is polarised distribution. Research consistently shows that the most effective training plans spend roughly 80% of time in Zones 1–2 and 20% in Zones 4–7. Zone 3 (tempo) is used sparingly — it accumulates fatigue without driving the same adaptation as true threshold or VO2max work.
A typical week for someone riding 8 hours might look like this:
| Day | Session | Zone | Duration |
|---|---|---|---|
| Tuesday | Threshold intervals | Z4 | 60 min |
| Wednesday | Endurance ride | Z2 | 90 min |
| Friday | VO2max intervals | Z5 | 60 min |
| Saturday | Long endurance ride | Z2 | 180 min |
| Sunday | Recovery spin | Z1 | 60 min |
The exact structure depends on your goal, available hours, and where you are in your training cycle. An off-season plan will be almost entirely Zone 1–2, while race preparation adds more Zone 4–5 work as the event approaches.
Zones Change Across Your Training Block
How much time you spend in each zone should shift as your plan progresses. A well-structured training block follows a periodised approach:
Base phase
Primarily Zone 1–2. Build aerobic capacity and endurance before adding intensity.
Build phase
Zone 4–5 intervals are added. Volume may drop slightly as intensity increases.
Peak & taper
Volume drops, sharpness stays. You arrive at your event fresh with fitness intact.
Understanding this progression is essential for long-term improvement. If you want to know how zones and periodisation translate into concrete W/kg gains, see our guide on how to increase watts per kg.
From Zones to a Full Plan
Knowing your zones is the first step. The next step is putting them into a periodised plan that progresses week by week — building volume, adding intensity at the right time, and tapering before your target event.
Lean Race Plan generates a free personalised training plan based on your FTP, available hours, and goal. Every session includes exact watt targets for your zones, structured intervals, and daily calorie recommendations.
Generate your training plan →Frequently Asked Questions
Do I need a power meter to use training zones?
A power meter gives the most accurate data, but you can estimate zones using heart rate or perceived exertion. Power is preferred because it responds instantly to effort changes, while heart rate lags by 30–60 seconds.
How often should I retest my FTP?
Every 6–8 weeks is a good cadence. As your fitness improves, your zones shift upward. Training in outdated zones means your easy rides may be too easy and your hard rides not hard enough.
Why is most training in Zone 2?
Zone 2 develops the aerobic system that powers all your other zones. Without a strong aerobic base, high-intensity work produces diminishing returns and increases injury risk. Even professional cyclists spend 70–80% of their time in Zone 1–2.
What is the difference between sweet spot and threshold?
Sweet spot (88–94% FTP) sits at the top of Zone 3 and the bottom of Zone 4. It provides a strong training stimulus with less fatigue than full threshold work, making it popular for time-limited riders who want to maximise gains per hour.