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Corpus is the dump and the study notes. Published targets use our synthesis — see Home and Method. The board uses what we publish.

Cardio — Intervals / HIIT / Sprints / VO2 protocols

Subject: Siim Land · Window 2023-09-18 → 2026-09-18
Pass: 2026-09-18

Summary (primary sources)

Claim type What Siim says Source
Personal HIT ~1×/week; often Norwegian 4×4 (4 min @ ~85–95% HRmax + 3 min @ ~60–70% × 4) OceysodInIo; F__fxx; site
Cadence tweak 4×4 sometimes once every ~10 days (not weekly) when strength takes priority F__fxx ~5:11
Sprint floor “at least one sprint workout per week” F__fxx; hrPen
Sprint structure examples e.g. 10×100 m walk-back; 3–5× 60–100 m all-out after warm-up; study protocols 30s / 20s / 250 m OceysodInIo; hrPen; F__fxx
Protocol survey video Gibala, Norwegian 4×4, SIT, Tabata, 30-30, etc. ranked/tested 6Z4HikG4RFs (2026-05-25)
VO2 Longevity marker; personal 53→66; weekend-warrior vs high-frequency can match VO2 if volume matched J1gO; X; r2agyaO6LBw

YouTube — exact quotes + timestamps

My 2026 Longevity Roadmap (OceysodInIo) — 2026-01-05

URL: https://www.youtube.com/watch?v=OceysodInIo

Timestamp Quote
1:49–1:55 “my VO2 max is in the range of 60 to 66, which would definitely put me [high]… Elite athletes might have a VO2 max of 70s, but 60 to 66 is still very good.”
31:45–31:52 “…sprint workouts, 10 sprints 100 m. Walk back there and repeat. So, trying to keep your heart rate elevated all the time.”
31:52–32:07 “Or these Norwegian 4 by 4 hit interval workouts, 4 minutes of very intense [effort]. So, let’s say 85 to 95% of your max heart rate, followed by 3 minutes of 60 to 70% repeated for four rounds. So, it’s a very brutal workout, but it’s also very effective.”
34:12–34:17 “I’ll just do once a week the hit 4 by 4 protocol, but I’ll do twice a week zone two cardio.”
33:17–33:34 “I’m going to be implementing some sprinting and plyometrics as well… speed training… declines with age.”

30 Seconds of This Beats 45 Minutes of Cardio (F__fxx_E9p4) — 2026-03-26

URL: https://www.youtube.com/watch?v=F__fxx_E9p4 · raw-transcripts/F__fxx_E9p4.en.srt

Timestamp Quote
2:13–2:27 Study arms: low-intensity cardio 55% peak power 130 min; Norwegian 4×4 at 90–95% peak power / 3 min rest @ 45% ×4; sprint intervals four 30-second max efforts / 7.5 min rest
2:40–3:08 GH 900–1,100% (sprint) vs 400–600% (4×4) vs 150–250% (long cardio); cortisol / testosterone comparisons as stated in video
~3:30+ (paraphrase avoided — see SRT) Argues mix of sprint / 4×4 / low-intensity for different goals; 4×4 best for VO2 among the three; low-intensity for lymphatic/steady endurance
5:09–5:25 “4x4 Norwegian protocol once every 10 days on average… instead of once a week. Zone two cardio at 60 to 70% max heart rate about once or twice a week.”
5:38–5:40 “What I recommend you do is have at least one sprint workout per week. That’s the bare minimum.”

The #1 Exercise That Keeps You Alive Longer (hrPenFGr768) — 2026-04-22

URL: https://www.youtube.com/watch?v=hrPenFGr768

Timestamp Quote
0:59–1:10 “sprinting is probably the best exercise you can do to slow down aging… when was the last time you sprinted?… an all-out sprint.”
6:50–6:55 Links sprinting to cardiorespiratory fitness / VO2 max (cites 2016 study comparison)
8:27–8:29 “What I recommend you do is have at least one sprint workout per week, maybe two to three if your workouts are shorter.”
~8:40+ Warm-up: 5 min easy jog/brisk walk → mobility → build-ups 30–40 m at 70/80/90% → main 3–5 all-out sprints 60–100 m; stop when speed drops

I Tested Every Popular HIIT Protocol (6Z4HikG4RFs) — 2026-05-25

URL: https://www.youtube.com/watch?v=6Z4HikG4RFs · raw-transcripts/6Z4HikG4RFs.en.srt

Timestamp Quote / content
0:18–0:26 Lists protocols: “Sprint interval training, the Norwegian 4 by 4 method, Tabata intervals, REHIT, shuttle runs, the Gibala method…”
1:44–2:15 Tabata origin (Izumi Tabata, 1996); compares VO2 changes vs steady-state group in the study he narrates
11:26–12:28 Gibala / “little method”; 2010 study mention; personal experience: “intervals are long enough… less intimidating than the Norwegian protocol… more sustainable… than Tabata” for average people
Full ranking / personal picks Backlog: finish line-by-line extract of his final ranking & weekly prescription from this video

Secondary summary of this video (not primary): Longevity Notes 2026-05-31 lists Gibala (1 min / 75 s rest ×8–12), 4×4, SIT 20s/2min, Tabata 20/10×8, 30-30 — verify against transcript before treating as quote.

The Science of Increasing VO2 Max in 3 Hours a Week (r2agyaO6LBw) — 2026-08-31

URL: https://www.youtube.com/watch?v=r2agyaO6LBw · transcript on disk
Status: Captured; curated quote table TBD next pass (pairs with X weekend-warrior thread same day).

I Did Zone 2… (J1gO-ZYxS-Q) — VO2 numbers

See Zone 2 for 53→66 quotes.

siimland.co

“I do 1 interval workout per week and 2-3 zone 2 workouts per week…”

Cardiorespiratory fitness: “Compared to those with the lowest cardiorespiratory fitness, those with the highest… have been seen to have a 4-fold lower risk of mortality (R).”

X @siimland — intervals / VO2

Date URL Exact text
2026-08-31 https://x.com/siimland/status/2094442770047893557 “If you don’t have a lot of time to workout, you can still get the same results with a ‘weekend warrior’ protocol // In this study, training either 4x/week with shorter workouts or 2x/week with longer workouts resulted in similar VO2 max adaptations // The catch: you have to match the [volume]…”
2026-08-31 https://x.com/siimland/status/2094442774401601995 “The protocols: High frequen[c]y 4x/week group: - 2x/week 35 min continuous cardio (~80% max hr) - 2x/week HIIT 4 min ~95% max hr, rest 3 min, 4 rounds // Weekend warrior: - 1 day 70 min continuous (~80%) - 1 day HIIT 4 min ~95%, rest 3 min, 8 rounds”
2026-05-26 https://x.com/siimland/status/2059158113484448119 “Just 2–3 all-out sprints may be enough to get most of the cardio fitness benefits of sprint interval training. // A meta-analysis of 34 studies found that: - Sprint interval training increased VO2 max by ~8% overall - Doing MORE sprint repetitions did not improve results…”
2025-10-29 https://x.com/siimland/status/1983571334618640652 “Months 3-10, they added the 4x4 Norwegian protocol: - 4 × 4 min at 90–95% HR peak - 3 min active recovery - 1–2 sessions/week”
2026-05-11 https://x.com/siimland/status/2053793761436512313 “What your VO2 max actually looks like: <15 … 15–25 … 26–35 → Out of shape …” (thread continues — backlog full ladder)
2026-08-27 https://x.com/siimland/status/2093008941378592839 “Things that matter more for longevity than any supplement or food: - VO2 max - Blood pressure - ApoB …”
2024-06-24 https://x.com/siimland/status/1805258450043081129 “HIIT cardio 1x week 30 min”

Studies Siim cites (intervals / VO2)

→ Sources Siim cites
Includes: Tabata 1996 (as narrated); Gibala 2010 (as narrated); 2013 hormone comparison (low-intensity vs 4×4 vs SIT); 2016 sprint vs continuous VO2 study; weekend-warrior VO2 study (need exact citation from video/X); SIT meta-analysis ~34 studies.

Backlog — intervals