VO2max training block: 8-week plan for runners and cyclists

A training block concentrates one type of stimulus for a few weeks so that the body adapts to it strongly before you move on. A VO2max block makes high-intensity intervals the priority for eight weeks, while the rest of your training stays easy. Below is a week-by-week plan for runners, a bike and rower version, and what to do once the block ends. To understand why these sessions were chosen, read the best training for VO2max and VO2max intervals compared.

Before you start a VO2max training block

• Base: at least 6 to 8 weeks of consistent easy running or riding, 3 to 5 times a week.
• Health: no current injury, and medical clearance if you have heart disease, high blood pressure or other risk factors.
• Baseline test: a 3k or 5k time trial, or a recent race. Convert it with the VO2max running calculator to get your starting value and interval paces.
• Heart rate zones: set 90–95% of max heart rate with the heart rate zone calculator.

Why the block is built this way

• Two sessions a week: the dose used in many successful trials. In Rønnestad et al. (2015), cyclists doing two 30/15 sessions a week for 10 weeks raised VO2max by 8.7%; in Helgerud et al. (2007), 4×4 training three days a week for eight weeks raised it by 7.2%. Our plan is two sessions plus easy days, because you also run easy in between.
• Progressing total hard minutes: in Seiler et al. (2013), 4 × 8 minutes at about 90% of peak heart rate beat 4 × 4 minutes at about 94%. Longer total time near the top matters, so the block grows from about 15 to 30 minutes.
• Mixing long and short reps: 30/30 and 30/15 formats keep you near VO2max for a long time with less strain per rep (Billat et al., 2000), while long reps carry the strongest evidence.
• Mostly easy training: in Stöggl and Sperlich (2014), a polarised plan raised VO2peak by 11.7% in nine weeks in well-trained athletes, more than threshold-heavy or volume-only training (80/20 training).
• A deload week: Buchheit and Laursen stress that the neuromuscular load of repeated fast running needs managing across the week and the block.

8 week VO2max plan for runners

Every session: 15 min warm-up with 3 to 4 strides, then 10 min easy cool-down. "Long reps" run at 90–95% HRmax (about 3k–5k race pace); "30/30" means 30 s at about 3k pace with 30 s easy jog.

Week	Session A (Tue)	Session B (Fri or Sat)	Hard minutes	Easy running
1	5 × 3 min, 2 min jog	2 × 8 × 30/30, 3 min between sets	~15 + 8	Normal volume
2	4×4 min, 3 min jog	2 × 10 × 30/30	~16 + 10	Normal
3	5 × 4 min, 2.5 min jog	3 × 10 × 30/30 or 6 × 2 min hills	~20 + 15	Normal
4 (deload)	4 × 3 min, 3 min jog	Easy run with 6 strides	~12	About 30% less
5	4 × 5 min, 2.5 min jog	3 × 10 × 30/30	~20 + 15	Normal, +5–10%
6	5 × 5 min, 2.5 min jog	3 × 12 × 15/15	~25 + 9	Normal
7	4 × 6 or 4 × 7 min, 2.5 min jog	3 × 12 × 30/30	~26 + 18	Normal
8 (test)	4 × 3 min, relaxed	3k or 5k time trial at weekend	Test	About 30% less

Notes:

• Fill the other days with easy runs and one long easy run. Keep at least one rest or very easy day after each session.
• If you race 5k, session A can become 5 × 1000 m at 5k pace; see the 5k training plan.
• Keep threshold out of weeks 1 to 7, or limit it to a short tempo in week 5, so the hard sessions stay fresh.
• Progress by time, not pace: add reps or minutes first. Raise pace only when the last rep feels controlled.

VO2max block on a bike or rower

Cycling and rowing reduce impact, so short intervals are easier to execute and you can tolerate slightly more volume. Intensity on the bike is about 106–120% of FTP for long reps; on the rower, around 2k race pace plus 2–4 s per 500 m.

Week	Session A	Session B
1	4 × 4 min, 3 min easy	2 × 13 × 30/15, 3 min between sets
2	5 × 4 min, 3 min easy	3 × 10 × 30/15
3	4 × 5 min, 2.5 min easy	3 × 13 × 30/15
4 (deload)	3 × 4 min	Easy ride or row with 5 × 30 s pickups
5	5 × 5 min, 2.5 min easy	3 × 13 × 30/15
6	4 × 8 min, 2 min easy	3 × 13 × 30/15
7	5 × 6 min, 2.5 min easy	3 × 13 × 30/15 + 1 extra set of 8
8 (test)	3 × 4 min, relaxed	20-min test or 2k row

The 3 × 13 × 30/15 format is the Rønnestad protocol. In elite cyclists, a three-week block of nine such sessions improved 20-minute power by 4.7%, against a 1.4% fall with long intervals (Rønnestad et al., 2020). More options for non-runners are in VO2max without running.

Progression and deload in a VO2max block

Signal	What it means	What to do
Last rep as fast as the first, HR settles quickly	Adapting well	Progress as planned
Can't hold pace in the last rep	Started too fast or tired	Same session next week, slightly slower
Resting HR up 5+ beats, poor sleep	Accumulated fatigue	Swap session B for easy, see HRV and recovery
Niggle in calf, Achilles or shin	Too much fast running	Move session B to bike or uphill

The week-4 deload drops volume by about 30% and keeps one short interval session, so you absorb the first three weeks without losing the stimulus. For how many sessions a week suit you outside a block, see how often to do VO2max workouts.

Advanced athletes sometimes use far denser blocks. In Breil et al. (2010), junior skiers did 15 sessions of 4×4 in 11 days and raised VO2max by 6.0%. That approach needs an experienced athlete and a long recovery afterwards.

Retest with the VO2max calculator

In week 8, run the same test as at the start, on a similar course, at a similar time of day. Enter the result in the VO2max calculator and compare. Beginners often see the largest gains; trained runners may see a few percent. If your watch estimate lags, trust the time trial (watch VO2max accuracy).

Maintenance after the block

• One VO2max session every 7 to 10 days, alternating 4×4 and 30/30.
• Shift focus to threshold training or race-specific work, with mostly easy volume.
• Repeat a block after 8 to 12 weeks, ideally with a different main format (for example 30/15 or 5 × 5).

Fitness fades slowly when intensity is kept: see how fast you lose VO2max. For how blocks fit a season, see periodisation for endurance, and find more running guides on VO2max for running.

Safety: if you have heart disease, high blood pressure, or symptoms such as chest pain or dizziness during exercise, get medical clearance before starting hard intervals.

Sources

• Helgerud J, et al. Aerobic high-intensity intervals improve VO2max more than moderate training. Med Sci Sports Exerc, 2007.
• Rønnestad BR, et al. Short intervals induce superior training adaptations compared with long intervals in cyclists: an effort-matched approach. Scand J Med Sci Sports, 2015.
• Rønnestad BR, et al. Superior performance improvements in elite cyclists following short-interval vs effort-matched long-interval training. Scand J Med Sci Sports, 2020.
• Seiler S, et al. Adaptations to aerobic interval training: interactive effects of exercise intensity and total work duration. Scand J Med Sci Sports, 2013.
• Billat VL, et al. Intermittent runs at the velocity associated with maximal oxygen uptake enables subjects to remain at maximal oxygen uptake for a longer time than intense but submaximal runs. Eur J Appl Physiol, 2000.
• Stöggl T, Sperlich B. Polarized training has greater impact on key endurance variables than threshold, high intensity, or high volume training. Front Physiol, 2014.
• Breil FA, et al. Block training periodization in alpine skiing: effects of 11-day HIT on VO2max and performance. Eur J Appl Physiol, 2010.
• Buchheit M, Laursen PB. High-intensity interval training, solutions to the programming puzzle. Part II: anaerobic energy, neuromuscular load and practical applications. Sports Med, 2013.