You don’t need a long workout to include effective VO₂ max training in your cycling programme.
When time is limited, the key is making the quality work count.
Jesper Medhus’ Time Effective VO₂ Max Intervals -2 is a 45-minute smart-trainer session that combines a progressive 20-minute warm-up with two sets of short, sharp Level V+ intervals.
The main set contains just ten 30-second Level V+ efforts, but don’t mistake short for easy. With only 30 seconds at Level II between repetitions, the recovery disappears quickly as each set progresses.
Your goal isn’t to produce one spectacular 30-second effort.
It’s to make the tenth repetition as purposeful as the first.
Session Inspiration
The inspiration for this session comes from cycling coach Jesper Medhus and his article Time Effective VO2 Max Intervals on Training4Cyclists.
The concept is particularly useful for cyclists and triathletes looking to include quality high-intensity training without needing a lengthy session.
I’ve adapted the concept into this -2 variation, with a substantial progressive warm-up before two sets of short Level V+ intervals.
The result is a compact workout that challenges your ability to repeatedly produce high-intensity power while maintaining quality as fatigue accumulates.
Today’s Workout
Jesper Medhus’ Time Effective VO₂ Max Intervals -2
Warm-Up
- 10min Level II
Extended Warm-Up
- 5min Level III-
- 3min Level III+
- 2min Level IV-
Main Set – Set One
5x:
- 30sec Level V+
- 30sec Level II Rest Interval (RI)
Between-Set Recovery
- 5min Level II
Main Set – Set Two
5x:
- 30sec Level V+
- 30sec Level II Rest Interval (RI)
Cool-Down
- 10min Level II
Post-Ride
- 10min Stretching
Total Riding Time: 45 minutes
Why You’re Doing This Session
VO₂ max training doesn’t always require several minutes of continuous high-intensity work.
Short repetitions allow you to repeatedly reach Level V+ while the brief recoveries prevent you from completely resetting between efforts.
In this session, each repetition is simple:
30 seconds Level V+.
30 seconds Level II.
Repeat.
Each complete work-and-recovery cycle lasts one minute, so each five-repetition set takes exactly five minutes.
The first couple of Level V+ efforts may feel relatively manageable.
Then the short recoveries begin to catch up with you.
Your breathing remains elevated, your legs receive only a brief respite, and you’re asked to accelerate back into Level V+ again.
After five repetitions, you receive five minutes at Level II before doing it all again.
The challenge is repeatability.
Rather than producing your biggest possible number during the first 30 seconds, you’re trying to produce ten quality Level V+ efforts across the workout.
Why the Extended Warm-Up Matters
There’s a full 20 minutes of progressive riding before the first Level V+ repetition.
That’s deliberate.
You begin with 10 minutes at Level II before gradually increasing the intensity through:
5min Level III- → 3min Level III+ → 2min Level IV-
This progressively increases the demand on your cardiovascular system and prepares your legs for the considerably harder efforts to come.
By the end of the two minutes at Level IV-, you should feel thoroughly warmed up and ready to work.
But you shouldn’t feel exhausted.
There’s an important distinction.
The warm-up should prepare you for the quality work—not steal quality from it.
What You Should Focus On
Build Through the Warm-Up
Respect the progression.
Don’t jump ahead and turn the Level III- portion into Level III+ or the Level III+ section into Level IV.
Let the intensity progressively increase and arrive at the main set properly prepared.
Get to Level V+ Promptly
Thirty seconds isn’t long.
When each work interval begins, increase your effort promptly so you’re actually spending the repetition at Level V+. You should be riding at 120-130% of your FTP.
That doesn’t mean producing an enormous five-second sprint before fading.
Accelerate smoothly, establish Level V+ and maintain it.
Make Every 30-Second Recovery Count
As soon as the work interval finishes, bring your intensity back to Level II.
Don’t continue pushing for another five or ten seconds.
Those 30 seconds are all you’ve got before the next Level V+ effort begins.
Use them.
Protect the Second Set
The five-minute Level II recovery between sets gives you an opportunity to reset.
Take advantage of it.
Ride easily, control your breathing and prepare yourself to reproduce the quality of your first set.
The second five repetitions aren’t an afterthought.
They’re half of the main set.
Common Mistakes To Avoid
Going too hard during the extended warm-up. The progressively increasing intensity prepares you for Level V+; it isn’t supposed to become another hard interval.
Sprinting the first repetition. This is Level V+ work, not an all-out 30-second power test. A bit more than Level V, maintain 120-130%.
Taking too long to reach Level V+. If you spend 15 seconds gradually building your effort, you’ve lost half the interval.
Making the Level II recoveries too hard. Recovery is part of the prescription. Respect it.
Stopping mentally after the fifth Level V+ effort. Remember that each repetition includes the following 30-second Level II RI, including the final repetition of each set.
Winning the first set. Your ability to reproduce quality during the second set matters more than producing one enormous number early in the workout.
Coach Ray’s Tips
I’d think of the ten Level V+ repetitions as one complete challenge split into two sets.
The first repetition establishes your benchmark.
Repetitions two through five ask whether you can reproduce it as fatigue accumulates and the 30-second recoveries start feeling increasingly short.
You then get five minutes at Level II to reset.
The second set asks whether you can do it all again.
Don’t judge this workout by your highest 30-second power.
I’d be much more interested in how closely your ten Level V+ efforts cluster together.
If your first effort is enormous but your power steadily declines afterwards, you’ve probably gone too hard.
I’d rather see ten controlled Level V+ efforts completed with good technique.
I’d also pay attention to your transitions.
With longer intervals, taking several seconds to establish the correct intensity doesn’t necessarily ruin the workout.
With a 30-second repetition, it matters considerably more.
Every second counts.
Coach Ray Rode This Session
I’ve also completed Jesper Medhus’ Time Effective VO₂ Max Intervals -2, and this is an interesting workout to review afterwards because the repeated 30-second work-and-recovery pattern should be very obvious across the power, heart-rate and cadence data.
My Strava Activity
My Workout Data
What My Data Shows
When reviewing my data from this workout, I’d start with the progressive warm-up.
Can I see the workload building through Level III-, Level III+ and Level IV- without unnecessary spikes?
Then I’d look at the ten Level V+ efforts.
How consistent was my power across the first five repetitions? After the five-minute Level II recovery, was I able to reproduce similar numbers during the second set?
Heart rate will tell a different story from power.
Because each work interval lasts only 30 seconds, heart rate won’t respond instantaneously to every change in intensity. Rather than expecting ten perfect heart-rate peaks matching the power trace, I’d look at how heart rate builds across each set and how effectively it drops during the five-minute recovery.
Cadence may also provide useful insight into whether my pedalling changed as fatigue accumulated.
Most importantly, I’d compare the opening repetitions with the final ones.
Was I still capable of producing Level V+ with good technique during repetitions nine and ten?
The goal isn’t one exceptional interval.
It’s ten quality efforts.
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If you’re looking for purposeful indoor cycling workouts rather than simply jumping on the trainer and riding hard, these sessions give every interval a specific job.
Ride Jesper Medhus’ Time Effective VO₂ Max Intervals -2 With Me on Velocity
Want to put this workout into practice without having to keep one eye on the clock?
Jesper Medhus’ Time Effective VO₂ Max Intervals -2 is available as a coach-led video workout on Velocity.
I’ll guide you through the progressive warm-up before taking you into both sets of short, sharp Level V+ intervals, including every 30-second recovery and the five-minute reset between sets.
With intervals this short, having the workout delivered and coached for you means you can concentrate on what matters: getting to Level V+ promptly, recovering properly and maintaining the quality of every repetition.
New to Velocity? Get 14 Days FREE
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Your trial gives you access to Velocity’s coach-led video workouts, so Jesper Medhus’ Time Effective VO₂ Max Intervals -2 is a great session to start with. Jump on your indoor trainer, follow along with me and experience how much easier it is to focus on executing the workout when the timing and structure are taken care of for you.
Then find Jesper Medhus’ Time Effective VO₂ Max Intervals -2 and come ride it with me.
Get to Level V+. Recover properly. Repeat the quality. 🚴🔥