Interval Training 101: How to Get Faster Without Riding Longer

Interval training is simply the act of breaking your ride into "work" periods where you go hard and "recovery" periods where you pedal easy to catch your breath. By taking these breaks, you can spend more total time at a high intensity than you ever could in one continuous effort. Think of it like lifting weights: you wouldn't try to lift a heavy barbell 50 times in a row, but you can do 5 sets of 10 with a short rest in between.

To get started, you need to know your "Threshold" or FTP (Functional Threshold Power). This is the maximum power you can roughly hold for an hour. Once you have that number, you can structure your intervals to target specific goals.

The Basic Structure

Every interval session should follow this simple four-step flow:

• Warm-up: 10–15 minutes of easy pedaling, including a few 30-second "spin-ups" to wake up your legs.
• The Work: This is the hard part. You’ll hold a specific power or effort level for a set amount of time.
• The Recovery: Slow down and pedal softly. This clears the "burn" from your muscles so you can go again.
• Cool-down: 5–10 minutes of very easy spinning to bring your heart rate back down.

Three Workouts to Try

If your FTP is 250W, here is how you would execute three classic interval sessions:

1. Sweet Spot (Building Stamina) This builds your "engine" without leaving you totally exhausted.

• The Workout: 2 x 15 minutes at 225W (90% of FTP).
• The Rest: 5 minutes of easy spinning between sets.
• Why it matters: It’s the "bang for your buck" workout that builds huge fitness fast.

2. Threshold Intervals (Increasing Speed) These teach you to suffer and push your FTP higher.

• The Workout: 3 x 10 minutes at 250W (100% of FTP).
• The Rest: 5 minutes of easy spinning between sets.
• Why it matters: This mimics a long climb or a fast group ride.

3. VO2 Max Intervals (The Ceiling Raiser) These are short and very intense. You should be gasping for air by the end.

• The Workout: 5 x 3 minutes at 300W (120% of FTP).
• The Rest: 3 minutes of very easy soft-pedaling between sets.
• Why it matters: These make your top-end speed feel much easier.

How to Stay Safe (The Traffic Light System)

Intervals are hard on your body, so you need to listen to your "Form" (TSB). If you use a training app, look at your numbers:

• Green Light: If you feel fresh, go for it.
• Yellow Light: If you’re a bit tired (TSB -25 to -40), maybe do one less interval or drop the power by 5%.
• Red Light: If you’re exhausted (TSB < -40), skip the intervals. A hard workout when you're "in the red" does more harm than good.

Quick Summary

• Don't overdo it: Two interval sessions a week is plenty for most people.
• Consistency wins: It's better to finish a slightly easier workout than to fail a workout that was too hard.
• Recover hard: You don't get faster during the workout; you get faster while you sleep afterward.