Indoor Cycle: Train by Power (Wattage), Explanation

Training with power provides immediate, objective feedback on your effort. Whether you're cycling outdoors with a powermeter or training at home on an ergometer like a home trainer, elliptical, treadmill, or rowing machine: wattage allows you to guide every workout effectively. In this article, you'll discover how to determine your Functional Threshold Power (FTP), how to use power zones, what a good wattage is in w/kg, and how to apply this practically with example workouts. You'll also get tips for effective indoor power training with suitable equipment.

Why train with power instead of heart rate?

Power reacts directly to what you do. If you pedal harder, you immediately see more watts. Heart rate lags behind and is influenced by sleep, caffeine, temperature, stress, and hydration. As a result, power allows for more precise pacing, especially during intervals, climbs, or headwinds. Wattage helps you ride steadily on a climb, avoid starting an interval too hard, and finish exactly on target pace.

Heart rate remains valuable as a secondary metric. By monitoring power and heart rate together, you can identify cardiovascular fatigue or heat effects, for example. Guidelines:

• Use power for guidance - heart rate for context.
• Preferably compare workouts under the same conditions and with the same measuring device.
• Work with power averages over 3-10 seconds to smooth out peaks and improve control.

What is FTP and how do you determine it?

FTP stands for the highest power you can sustain for approximately 40-60 minutes, practically often approximated via a 20-minute test. FTP is the basis for your power zones and many training plans. A higher FTP generally means that your sustained power and endurance at pace have improved.

Common ways to determine your FTP:

• 20-minute test outdoors or on an indoor cycle: after a good warm-up, ride as hard as possible for 20 minutes, maintaining an even effort. Take 95 percent of your 20-minute average power as an estimate of your FTP.
• Ramp test on an ergometer: resistance increases every minute until exhaustion. Software or the ergometer calculates your FTP based on peak level and duration.
• Field data profile: if you train regularly with power, you can use your best 40-60 minute performances as a practical FTP indication.

Here's how to conduct the 20-minute test effectively:

• Warm-up 15-20 minutes with 2-3 short accelerations.
• Start slightly conservatively and try to stabilize at a steady pace after 5 minutes.
• Use 10s-average power on your display for easier pacing.
• Finish the test with 5-10 minutes of easy cool-down.

Retest every 6-8 weeks or when you notice that workouts are consistently too easy or too hard. If you train indoors on an ergometer or home trainer, ideally use the same settings and the same device for reliable comparisons.

Power zones: how to use them

Power zones help you train purposefully. From recovery to sprint, each zone stimulates a different energy system and training goal. Base your zones on your FTP and revise them after each retest. Work with clear target zones for each workout and limit the number of "grey rides" in vague middle zones.

W/kg and what is a good wattage?

Watts per kilogram (w/kg) allows for performance comparison between riders of different weights, especially for climbing or longer efforts. Absolute watts remain relevant for sprints and flat time trials, but w/kg is a useful indicator for endurance and climbing. The guidelines below are indicative – focus on your personal progress and consistency.

Note: goals like "300 watts" mean little without the context of your weight, duration, and terrain. Therefore, work with FTP and zones, and use w/kg as an additional reference.

Starting power training: settings and steps

With a few practical settings, you can immediately get more out of your wattage data:

• Calibrate your measurement: zero-offset procedure for your powermeter or standard calibration on your ergometer.
• Screen display: show 10s-average power for steady blocks, 3s for short intervals.
• Set your FTP and zones on your bike computer/device: this ensures alerts and targets are accurate.
• Use the lap button: this clearly marks intervals and blocks.
• Plan your week: 1-2 quality workouts in clear zones, supplemented with Z2 endurance rides and recovery.
• Record RPE and heart rate alongside power: to identify trends and fatigue.

Intervals and example workouts

Examples you can apply directly. Adjust the power to your own zones and allow for sufficient recovery.

• Z2 endurance – build base: 60-120 min in Z2. Optional 3 x 5 min in Z3 for variation.
• Threshold blocks – increase FTP: 3 x 12 min in Z4 with 6 min recovery. Advanced: 3 x 15 min.
• VO2max – boost aerobic power: 5 x 3 min in Z5 with 3 min easy recovery. Start controlled, finish evenly.
• Anaerobic – punch and tolerance: 8 x 1 min in Z6 with 2 min recovery. Keep the first half of the block slightly below target and build up.
• Sprint – neuromuscular: 6-8 sprints of 8-12 s in Z7 with full recovery breaks of 3-5 min.

For HIIT and short power intervals, air bikes and air runners with wattage display are an excellent alternative.

Structure your weeks with 1-2 intensive sessions, supplemented with easy endurance. Do not schedule heavy blocks on consecutive days and reduce volume in a recovery week every 3-5 weeks.

Do you want a complete approach with examples? Check out Indoor cycle training: method and schedules by watts.

Home training with power: suitable equipment

At home, you can train with power just as effectively as outdoors. Ergometer-controlled devices maintain constant resistance, keeping you exactly in your zone. Using an online training app? Read Zwift: how to train at home with power for power zones, ERG mode, and structured workouts.

• Home trainers with wattage programs:
  • Tunturi Signature E50 Home Trainer - 20 to 350 watts in 5-watt increments.
  • Tunturi Signature E60 Home Trainer and E80 - wattage-controlled programs up to 350 watts.
• Indoor cycle for intensive sessions:

  Also check out our indoor cycles with accurate wattage display for precise FTP and interval training.

  • VirtuFit Etappe 2.0i Indoor Cycle Bike - suitable for high intensities and sprint work.
• Elliptical trainers with wattage control:
  • Tunturi Platinum CT20 - 35 to 400 watts, ideal for endurance and tempo.
  • Tunturi Signature C65-F - 20 to 350 watts.
• Treadmill with wattage program:
  • Matrix TF50 - XUR - wattage-controlled training options in addition to speed and incline.
• Rowing machine with power display:
  • VirtuFit Ultimate Pro 2i Rowing Machine - insight into power and cadence for structured blocks.

When training indoors, choose equipment that matches your goal. If you want to train specifically for cycling, a home trainer or indoor cycle provides the most comparable stimulus. For all-round fitness and joint-friendliness, an elliptical and rower are very effective. Want to row with power? Read Rowing machine: power training explained. Undecided between models? Quickly compare in the Top 10 indoor cycles for power training.

The biggest pitfall is comparing yourself to others without context. Your wattages are unique due to weight, body composition, experience, and type of effort. Primarily measure progress relative to yourself.

• Pitfalls: staying in Z3 too often, too many intensive days in a row, pacing based on 1s-power, and forgetting to retest.
• Monitor: track your best 5s, 1min, 5min, and 20-60min to see your power-duration curve grow.
• Consistency: keep equipment, measurement method, and conditions as consistent as possible for reliable comparisons.
• Combine: in addition to power, use heart rate and RPE to monitor fatigue and recovery.