Exploding off the start
Going off as if it were a 60 metres, then collapsing after ten seconds, is the surest way to get injured without getting the benefit. The speed is maximal, but held for the full 30 seconds.
RunningSpeed and sprintsAdvanced 46 min
All-out 30-second running sprints (6 × 30 s)
Running sprint intervals: six all-out 30-second sprints, separated by 3 min 30 of slow jogging. Three minutes of work in a 46-minute session. A format studied in well-trained runners, with real gains in speed and a documented injury risk.
Session profile14 blocks
At a glance
- Duration
- 46 min
- Main target
- 130–175%vVO₂max7 Z7 · Neuromuscular
- Time at target
- 3 min
- Estimated load
- 46
- Structure
- 6 × 30″ at 130–175% vVO₂max, 3′30 recovery
- Level
- Advanced
- Equipment
- GPS watch · Track (optional)
The session in detail
vVO₂max
Time in zone
- Z138 min
- Z25 min
- Z73 min
What the targets mean
| Target | Zone | Time | vVO₂max 14 km/h | vVO₂max 16 km/h | vVO₂max 18 km/h |
|---|---|---|---|---|---|
| 130–175% | 7Neuromuscular | 3 min | 3:18/km–2:27/km 152–204 m per rep | 2:53/km–2:09/km 173–233 m per rep | 2:34/km–1:54/km 195–263 m per rep |
| 50–60% | 1Recovery | 18 min | 8:34/km–7:09/km 408–490 m per rep | 7:30/km–6:15/km 467–560 m per rep | 6:40/km–5:33/km 525–630 m per rep |
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What this session is for
Thirty seconds flat out works your anaerobic capacity, power and speed, on very little volume. In running, the studies mostly show gains in speed, over short distances and over 3,000 metres alike. The effect on VO₂max is small, though: for that, longer intervals do better.
The format comes from cycling, where Martin Gibala's group made it famous. On foot it changes character: every stride takes your body weight at very high speed, and your hamstrings work at their limit. That's where the injury risk lies.
Who it's for
Experienced runners in good health, already used to fast running: strides, short intervals, hills. You need a recently measured vVO₂max to set the warm-up and recoveries. If you've had a muscle injury before, in your hamstrings or calves, go for hill sprints instead.
When to do it
One session of this kind a week at most, on fresh legs, after an easy day or a rest day. Avoid the day before a long run, another hard session or a race. Start with 4 sprints, then build to 6 over the weeks.
How to do it
Warm-up
15 min10′ at 60–65% vVO₂max + 5′ at 66–72% vVO₂max
10 minutes of easy running at 60–65% of vVO₂max, then 5 minutes at 66–72%. Add some drills and three or four gradual strides on a straight: your hamstrings need to be ready before the first sprint.
Main set
21 min6 × 30″ at 130–175% vVO₂max, 3′30 recovery
Six 30-second sprints at maximum but controlled speed: fast from the start, without exploding over the first ten metres and then falling apart. At 16 km/h, you'll cover 173 to 233 metres, between 2:53 and 2:09/km: the 130–175% of vVO₂max range is a guide, don't cap it. Between sprints, 3 min 30 of very slow jogging at 50–60% of vVO₂max, or 467 to 560 metres at 16 km/h.
Cool-down
10 min10′ at 55–65% vVO₂max
10 minutes of very easy running at 55–65% of vVO₂max. If a sprint left you with a sharp pain in the back of the thigh or the calf, stop the session and don't go again until you've fully recovered.
How it should feel
The burn arrives around fifteen seconds in, and the last ten are very hard: heavy legs, sometimes shaky, stride shortening. The 3 min 30 of jogging feels long, but you need it. Guide: 10 out of 10 on the efforts.
Common mistakes
Skimping on the warm-up
An all-out sprint on cold muscles is the classic recipe for a tear. Drills, strides, gradual accelerations: the warm-up for this session is longer than usual, deliberately.
Aiming for the studies' 10 sprints
The running studies used 10 sprints in highly trained runners, and that's the format in which they recorded injuries. For an amateur runner, 4 to 6 sprints is plenty.
Running on a slippery surface
Wet grass, a tight bend, an uneven surface: at this speed, a slip is costly. Pick a track or a flat, dry straight.
When to skip it
Before you start
- A recently measured vVO₂max.
- Experience of fast running: strides, short intervals or hills.
Skip it if
- You're new to running, or coming back after a break.
- You've had a muscle injury in your hamstrings or calves before.
- You're tired, or a long run, hard session or race is planned for the next day.
Origin and evidence
Level of evidence
Good evidenceLevel 4 of 5
Gibala and colleagues (J Physiol 2006;575(3):901-911), 16 active men, 6 sessions in 14 days of 4 to 6 × 30 seconds all out on a bike, at about 250% of VO₂peak, with 4 minutes' recovery: adaptations comparable to endurance training of far greater volume. In running, Hov and colleagues (Scand J Med Sci Sports 2023;33(2):146-159), 48 well-trained men, 10 × 30 seconds all out, about 175% of vVO₂max on average on a treadmill, with 3 min 30 of active recovery: no significant rise in VO₂max, but 3,000 m improved by 2.2 ± 2.2% and 300 m by 3.3 ± 2.8%. Helgerud and colleagues (Scand J Med Sci Sports 2023;33(11):2193-2207), 81 well-trained women: 8 training-related injuries in the 10 × 30-second group, none in the 4 × 4-minute and 8 × 20-second groups. The number of sprints, between the cycling and running versions, the 130–175% range, the recovery intensity, which the studies don't specify, the warm-up and the cool-down are Wattson choices. Bottom line: good evidence on the principle, with a documented injury risk in running.
Sources
- Gibala M. J. et al., J Physiol 2006;575(3):901-911
- Hov H. et al., Scand J Med Sci Sports 2023;33(2):146-159
- Helgerud J. et al., Scand J Med Sci Sports 2023;33(11):2193-2207
Frequently asked questions
How fast should 30-second sprints be run?
At maximum speed, held for the full 30 seconds. As a rough guide: 130 to 175% of your vVO₂max, or 152 to 204 metres at 14 km/h, 173 to 233 metres at 16 km/h, 195 to 263 metres at 18 km/h. An amateur runner will often be at the bottom of the range, and that's normal.
Do 30-second sprints improve VO₂max?
In running, not much. In well-trained runners, this format improved speed, over 300 metres and over 3,000 metres, without clearly raising VO₂max. For that, longer intervals such as the Norwegian 4x4 did better in the same studies.
Are 30-second sprints risky?
More than most sessions. In one study of well-trained female runners, the group doing 30-second sprints had several training-related injuries, against none in the longer-interval groups. A thorough warm-up, a safe surface and low volume are the three safeguards.
Why 6 sprints, not 4 or 10?
On the bike, Gibala's studies used 4 to 6 sprints; in running, the studies used 10, in highly trained runners. Six sits in between: it's a Wattson choice, designed to limit the risk. Start with 4 if the format is new to you.
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