Magness says amateurs should swap 4x3min for 8x30sec
The coach says long reps are the easiest workout for a non-elite runner to ruin.
Steve Magness says most amateur runners doing VO2 max work (training at the ceiling of how much oxygen your body can use) should stop reaching for long reps.
His swap is specific. Instead of 4x3min at 5K pace with 2min rest, he prescribes sets of 8x30sec with 45sec rest at 5K to 3K effort. He frames the advice around VO2 max work for health and longevity in the general population, not around elite racing.
Why he says long reps fail
Pacing. Magness says 4x3min is easier to mess up for amateurs, and the way it goes wrong is predictable. They start too hard, and then the back end of the session turns into damage control rather than training.
He also says longer reps are hard to sustain in exactly the place amateurs are weakest, which is staying engaged for minutes at a time. Short reps, in his telling, are more manageable and leave more wiggle room. Get the pace a little wrong on a 30 second rep and the recovery bails you out before the next one.
What it actually means
This is a coach's take on execution, not a claim that 30 seconds is physiologically superior to three minutes. Magness is arguing that the workout a runner can actually hit is better than the workout that looks right on paper and falls apart by rep three.
It does cut against the line we ran on October 27, when Brady Holmer said research favoured intervals of two minutes or longer over 30 second sprint intervals for raising VO2 max. The two are not quite answering the same question. Holmer was talking about what raises the number. Magness is talking about what a non-elite runner can pace correctly on a Tuesday evening without blowing up.
Worth noticing that Magness attaches a control condition to the short reps. The 8x30sec are run at a controlled pace, with 45 seconds of recovery, not as all-out sprints. The recovery is longer than the rep. That is a different animal from the hardest sprint interval protocols, and closer to a way of accumulating time near 5K to 3K effort without ever being in survival mode.
If you are a fall marathoner slotting in a weekly VO2 max session and you keep finishing those sessions ruined, this is the argument for shortening the rep rather than softening the pace.
WHat tends to happen, they go too hard, and last few reps are just survival and not getting the right adaptation.
Short intervals are more manageable, and they leave more wiggle room.
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