One of the biggest mistakes athletes make with VO2 max training is treating it like threshold training.
The workout hurts a little.
Breathing becomes harder.
The legs feel loaded.
It feels difficult, so it must be working.
Not necessarily.
When it comes to VO2 max intervals, many athletes pace themselves too conservatively and never actually spend enough time working at the intensity required to maximise the adaptation.
The result?
A session that feels hard but doesn’t deliver the full benefit.
What Is VO2 Max?
VO2 max is your body’s maximum ability to take in, transport, and utilise oxygen (O2) during exercise.
Think of it as the ceiling of your aerobic engine.
The higher your VO2 max, the greater your potential to produce aerobic power and sustain faster speeds or higher wattages.
While endurance athletes often spend most of their training time at easier intensities, strategically placed VO2 max sessions can help lift that ceiling and improve overall performance.
Why Athletes Underperform These Sessions
Most athletes start VO2 intervals cautiously.
They worry about blowing up.
They worry about not finishing the workout.
They worry about maintaining consistency across all repetitions.
Those concerns are understandable, but they often result in efforts that are simply too controlled.
A VO2 max interval should not feel comfortable.
Within the first minute, breathing should be noticeably elevated.
By the end of the effort, talking should be difficult and concentration should be focused almost entirely on maintaining the target effort.
If you finish every repetition feeling like you had plenty left in reserve, the workout may have been closer to threshold training than VO2 max training.
Understanding the Difference
Threshold training teaches you to sustain a hard effort for an extended period.
VO2 max training teaches your body to work near its aerobic limit.
That means the sensations are different.
Threshold intervals often feel controlled and sustainable.
VO2 max intervals feel uncomfortable much sooner.
The goal is not to pace them like a 20-minute effort.
The goal is to spend time operating close to your maximum aerobic capacity.
That requires commitment.
Common VO2 Max Session Mistakes
Starting Too Conservatively
Many athletes spend half the interval building into the effort.
By the time they reach the correct intensity, the repetition is nearly over.
Instead, aim to reach the target effort quickly and settle into it.
Recovering Too Long
VO2 max sessions often rely on incomplete recovery.
If recovery periods are too easy or too long, heart rate and oxygen demand drop significantly, reducing the effectiveness of the next repetition.
Chasing Power Instead of Purpose
Power matters.
Pace matters.
But the goal is the physiological response.
The session should create significant cardiovascular demand, not simply produce impressive numbers on a screen.
What VO2 Max Efforts Should Feel Like
A good VO2 max interval should feel challenging from relatively early in the effort.
Breathing becomes heavy.
Legs begin to fatigue.
Focus narrows.
You know you are working.
That doesn’t mean every repetition should be an all-out sprint.
The objective is controlled aggression.
Hard enough to challenge your aerobic system.
Controlled enough to complete the entire session effectively.
Trust the Recovery
Many athletes fear pushing hard because they worry about surviving the next repetition.
That’s exactly why recovery intervals exist.
Use them.
Allow your breathing and heart rate to come down enough to prepare for the next effort.
Then commit fully when the next interval begins.
The recovery is there to enable quality work, not to make the session easy.
The Goal Isn’t Comfort
VO2 max training is one of the most effective tools for improving aerobic performance.
But it only works when the intensity is high enough.
If your short intervals always feel comfortable, controlled, and predictable, you may be leaving significant gains on the table.
The next time your training plan calls for VO2 max work, don’t pace it like a threshold session.
Commit to the effort.
Trust the recovery.
Embrace the discomfort.
That’s where the adaptation happens.
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Train smarter. Ride stronger. Stay consistent.