Everything you need to know about power-based cycling training and the WattPlan platform.
FTP (Functional Threshold Power) is the highest power output you can sustain for approximately one hour. It represents the boundary between sustainable aerobic exercise and unsustainable anaerobic effort.
FTP is measured in watts and serves as the foundation for power-based training zones. All structured workouts in WattPlan are scaled to your FTP, ensuring the intensity is appropriate for your current fitness level.
The most common FTP test is the 20-minute test:
Alternative methods include:
WattPlan includes guided FTP test protocols with automatic calculation.
Most athletes should retest FTP every 4-8 weeks during structured training, or whenever you suspect significant fitness changes. Signs you need to retest:
WattPlan can also estimate FTP changes from your workout data and suggest when retesting may be beneficial.
Weighted Power is an estimate of the power you could have maintained for the same physiological cost if you had pedaled at a perfectly constant effort.
It accounts for the fact that variable power (intervals, hills, surges) is more demanding than steady power at the same average. A ride with 200w average but lots of surges might have 220w Weighted Power.
Weighted Power is used to calculate Training Load and is generally more useful than average power for understanding ride intensity.
Watts per kilogram (w/kg) is your power output divided by your body weight. It's the most important metric for climbing performance, as gravity affects heavier riders more.
Reference values for FTP w/kg:
For flat time trials and sprinting, absolute watts matter more than w/kg.
Zone 2 is endurance-paced training at 56-75% of your FTP. It develops aerobic base fitness, improves fat oxidation, and builds mitochondrial density without excessive fatigue.
Most training plans recommend 70-80% of training volume in Zone 2, making it the foundation of endurance cycling. Zone 2 rides should feel conversational and sustainable for hours.
Sweet Spot is training at 84-97% of FTP, the "sweet spot" between high training stimulus and manageable recovery demands. It's harder than tempo but more sustainable than threshold.
Sweet Spot intervals are popular because they provide significant fitness gains with less fatigue than threshold work, allowing for more total training volume.
Typical Sweet Spot workouts involve 2x20 minutes, 3x15 minutes, or similar blocks with short recovery intervals.
WattPlan uses the classic 7-zone system based on FTP:
Each zone targets different energy systems and adaptations.
Training zones are calculated as percentages of your FTP. For example, with an FTP of 250w:
WattPlan automatically calculates your zones when you set your FTP and displays them in all workout descriptions.
Tempo (Zone 3, 76-90% FTP) is "comfortably hard" - you can sustain it for extended periods but conversation becomes difficult. It builds muscular endurance and trains your body to process lactate.
Threshold (Zone 4, 91-105% FTP) is the maximum sustainable effort for about an hour. It directly trains your FTP but is demanding and requires recovery.
Tempo allows more volume with less fatigue; threshold provides more specific FTP adaptations but limits total training time.
The Base phase builds aerobic foundation through predominantly Zone 2 training with some tempo work. It focuses on:
Base phase typically lasts 4-8 weeks and sets the foundation for more intense training in subsequent phases.
The Build phase increases intensity while maintaining much of the base volume. Training includes:
Build phase typically lasts 4-6 weeks and represents peak training load before tapering.
Tapering is the strategic reduction of training volume before a goal event to allow full recovery while maintaining fitness. During a taper:
Taper length depends on event importance: 1 week for small events, 2-3 weeks for A-priority goals. WattPlan automatically builds appropriate tapers into generated plans.
Most athletes benefit from a recovery week every 3-4 weeks of training. During recovery weeks:
Recovery weeks allow accumulated fatigue to dissipate, enabling fitness adaptations to consolidate. Skipping recovery weeks often leads to plateaus or overtraining.
Linear periodization gradually increases intensity while decreasing volume over the training cycle. It's traditional and works well for single-peak seasons.
Block periodization focuses on one quality per training block (e.g., 3 weeks of threshold work, then 3 weeks of VO2max). It can produce faster gains but requires careful planning.
WattPlan uses a hybrid approach that incorporates principles from both methods based on your goals and timeline.
Fitness represents your long-term training capacity as an exponentially weighted average of your daily Training Load over approximately 42 days. Higher Fitness indicates greater endurance capacity.
Reference Fitness values:
Fatigue represents your recent training stress as an exponentially weighted average of your daily Training Load over approximately 7 days. Higher Fatigue indicates more accumulated training stress.
Fatigue responds quickly to training changes - it rises after hard days and falls during rest. Managing Fatigue helps prevent overreaching and ensures adequate recovery.
Form is the difference between Fitness and Fatigue. It indicates how fresh and ready to perform you are.
Training Load quantifies the stress of a single workout based on duration and intensity relative to your FTP. A 1-hour ride at FTP equals 100 Training Load.
Training Load formula: Load = (seconds x WP x IF) / (FTP x 3600) x 100
Recovery guidelines by Training Load:
For optimal race day performance, target a Form between +10 and +25. This range provides freshness while maintaining fitness.
The optimal value varies individually. Track your best performances and note your Form to find your personal sweet spot. Some athletes perform best at +15, others at +20.
WattPlan plans automatically taper to achieve positive Form for your event date.
Warning signs of overtraining include:
If you notice multiple signs, take 5-7 days of easy riding or complete rest, then gradually resume training.
Most recreational and amateur cyclists benefit from 1-2 complete rest days per week. The optimal number depends on:
WattPlan plans typically include 1 rest day and 1-2 easy/recovery days per week. Listen to your body and add rest if needed.
A deload (or recovery) week is a planned reduction in training load, typically 40-50% of normal volume. Purpose:
Deload weeks are typically scheduled every 3-4 weeks of training. WattPlan automatically incorporates them into generated plans.
Both have their place. Active recovery (easy spinning at Zone 1) can promote blood flow and may speed recovery, but only if it's truly easy.
Complete rest is better when:
The key is that active recovery must be Zone 1 - any harder defeats the purpose.
Sleep is critical for performance and adaptation. During sleep:
Most athletes need 7-9 hours. Chronic sleep deprivation impairs performance similarly to overtraining. Prioritize sleep, especially during heavy training blocks.
Pre-ride nutrition depends on ride duration and intensity:
2-3 hours before: A balanced meal with carbs, moderate protein, and low fat (oatmeal, toast with peanut butter, rice with eggs)
1 hour before: Easily digestible carbs (banana, energy bar, white bread with jam)
For easy rides <90 min: A light snack or nothing is fine
For hard/long rides: Ensure glycogen stores are full with adequate carbs the night before and morning of.
Fueling guidelines during riding:
Start fueling early (within 30-45 min) and consume small amounts regularly rather than large amounts infrequently. Your gut can be trained to absorb more carbs with practice.
Post-ride recovery nutrition should include:
Examples: chocolate milk, protein shake with banana, rice with chicken, yogurt with granola. The recovery window is most important after hard or depleting efforts.
Fluid needs vary by temperature, intensity, and individual sweat rate. General guidelines:
Include electrolytes (especially sodium) for rides over 90 minutes or in hot weather. Weigh yourself before and after rides to calculate your personal sweat rate.
Carb loading can benefit events lasting >90 minutes at moderate-high intensity. Modern approach:
For shorter events or time trials, normal high-carb eating the day before is sufficient. Don't try new foods on race day.
ERG mode is a smart trainer feature that automatically adjusts resistance to maintain a target power output regardless of your cadence. Benefits:
Drawbacks: Can feel artificial, and if you slow cadence too much, the resistance increases dramatically ("spiral of death"). Some athletes prefer standard mode for a more realistic feel.
For accurate and comfortable indoor training:
Recalibrate every few weeks or when power readings seem off.
Many cyclists find indoor power 5-15% lower than outdoor. Reasons include:
Some athletes use a separate (lower) indoor FTP. WattPlan can track both if needed.
Tips for productive indoor sessions:
WattPlan uses AI to provide personalized coaching:
The AI applies coaching-level thinking while adapting to your individual situation.
WattPlan integrates with popular cycling platforms:
You can also manually import .FIT and .TCX files from any device.
WattPlan's training logic is built on established, peer-reviewed exercise physiology — not AI-generated advice. The core models include:
These are the same models used by TrainingPeaks, WKO5, and professional coaches. The AI coach serves as an intelligent interface that interprets your data in natural language — the underlying calculations are deterministic and validated by nearly 4,000 automated tests.
Right now, your data is used exclusively to build your training plan and provide personalised coaching. It is not used to train, fine-tune, or improve any AI model.
In the future, we plan to use anonymised, aggregated data to build more informed coaching models — understanding how athletes respond to different training loads and where common plateaus occur. This will never include personally identifiable information, and you'll always be able to opt out.
Your data is never sold or shared with third parties. You can delete your account at any time and all data is permanently removed.
WattPlan takes data privacy seriously:
Yes, you can cancel your Premium subscription at any time:
We also offer a 14-day refund policy if you're not satisfied.