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SurgeIQ Lab

Endurance vs Threshold vs VO2max Workouts

Endurance, threshold and VO2max sessions look different because they ask different things of you. Here is what each is typically for, how it is usually built, and how they share a week.

Published

At a glance

TypeTypical intensityTypical structureFeels like
Endurance55–75% FTPOne long steady blockConversational
Threshold90–105% FTP2–4 blocks of ~8–20 minHard but controlled
VO2max105–120% FTP4–6 × 3–5 min, similar recoveryVery hard; breathing maxed by the end
Anaerobic / sprints120%+ FTPMany short efforts, 10 s–2 minAll-out, brief

Endurance

Long, steady rides in zone 2 make up most training time for most endurance cyclists. Research on how well-trained endurance athletes distribute their training consistently finds a large share at low intensity (Seiler, 2010). These rides are easy to underrate and easy to overcook: the target is steady and sustainable, not a slow race.

  1. Warmup10 min50–60% FTP
  2. Steady endurance1 h 10 min60–70% FTP

    Conversational effort; smooth, consistent pressure.

  3. Cooldown10 min<55% FTP
Endurance 90: warmup, 70 min at 60–70% FTP, cooldown.

Threshold

Threshold work sits around FTP. Sessions split the time into a few long blocks so you can hold a controlled, near-FTP effort with short recoveries. Even pacing matters more than the exact number: the last block should look like the first.

3×
  1. Warmup15 min50–70% FTP
  2. Repeat 3×
    1. Threshold10 min95–100% FTP

      Even pacing from the first minute.

    2. Recover5 min45–55% FTP
  3. Cooldown10 min<60% FTP
Threshold 3 × 10: 3 × 10 min at 95–100% FTP with 5 min recovery.

VO2max

VO2max intervals are hard efforts of a few minutes above FTP, with recoveries about as long as the work. They are demanding, so they are usually a small part of the week and are best done fresh.

5×
  1. Warmup15 min50–70% FTP
  2. Repeat 5×
    1. VO2max3 min110–120% FTP
    2. Recover3 min40–55% FTP
  3. Cooldown10 min<60% FTP
VO2max 5 × 3: 5 × 3 min at 110–120% FTP with 3 min recovery.

Short, hard efforts

Efforts from a few seconds to two minutes above 120% FTP train sprinting and the ability to handle surges. Because they are so short, many riders pair them with a cadence target and full concentration on form.

10×
  1. Warmup15 min50–70% FTP
  2. Repeat 10×
    1. Hard30 s120–140% FTP95–110 rpm
    2. Easy30 s40–55% FTP
  3. Easy spin5 min<55% FTP
  4. Cooldown10 min<60% FTP
30/30s: 10 × 30 s at 120–140% FTP with 30 s easy.

Sharing a week

Hard sessions are usually separated by easy days so each gets done well, and the total weekly load rises gradually across a plan with lighter weeks in between. A simple example week with two quality sessions:

DaySession
MonRest
TueVO2max 5 × 3
WedRecovery spin 45 min
ThuThreshold 3 × 10
FriRest or easy
SatEndurance 90–150 min
SunEndurance or recovery

This is an illustration of the principle, not a plan to follow; the right mix depends on your goal, history and available time.

Common mistakes

  • Riding endurance days too hard, then being too tired to hit the hard days properly.
  • Starting threshold and VO2max intervals above the range and fading.
  • Cutting recoveries short — it changes the session into a different one.
  • Stacking hard days with no easy day between them.

Where to go next

How this guide was written

Ranges use SurgeIQ Lab’s zone boundaries (see FTP and power zones). Durations are typical examples, not prescriptions.

Sources