The 80/20 Aerobic Base for HRV
Raise heart rate variability by training mostly easy and rarely hard
- Difficulty
- Moderate
- Time to result
- ~months to results
- Steps
- 5
- Confidence
- 85%
HRV rises when the aerobic system improves, and the aerobic system improves through polarized training rather than constant maximal effort. Jamieson prescribes spending about 80% of training time at low-to-moderate intensity (below ~90% of max heart rate, often 120-160 bpm) and only about 20% at true high intensity above 90% of max, delivered as intervals roughly twice a week. The easy volume supplies stimulus without breaking the body, while the sparse high-intensity work drives peak adaptations. Done consistently four to six days a week, this pattern reliably raises HRV, lowers resting heart rate, and mirrors how endurance athletes, who show both the highest HRV and the longest lifespans, actually train. The mechanism is balance: more anabolic recovery, less chronic catabolic stress.
Origin
Developed by strength and conditioning coach Joel Jamieson across two decades training elite fighters and general clients, after he began using early Russian HRV technology (the Omega Wave) in the early 2000s and saw which training patterns consistently raised the number.
Core principles
- 01Aerobic fitness is the primary driver of rising HRV
- 02You can only tolerate so much high intensity before you break
- 03Consistency over months beats maximal effort in a single week
- 04Endurance athletes show the highest HRV and the longest lifespans
- 05Low and moderate work builds the volume that produces the stimulus
How to run it
- 1
Commit to frequency, not just intensity
Train some form of aerobic work four to six days per week. Two days a week can maintain strength but will not meaningfully improve aerobic fitness or HRV.
Pro tip Treat the schedule as the non-negotiable; the intensity distribution fills in around it.
- 2
Make 80% of it low-to-moderate
Spend the majority of your weekly time below about 90% of max heart rate, doing 30-40 minute sessions of steady aerobic work. For most people this lands around 120-160 bpm.
Pro tip If you can hold a conversation and sustain it comfortably, you are in the right zone.
Watch out This will feel too easy; that is the point, not a flaw.
- 3
Reserve 20% for true high intensity
Roughly two days a week, do interval work that pushes heart rate above 90% of max, into the 160s-180s for many people, for short durations.
Pro tip Keep these sessions short; intensity, not duration, is what you are after here.
Watch out Doing high intensity most days is the exact mistake that causes plateau, burnout, and injury.
- 4
Pick a sustainable modality
Choose activities you will keep doing, whether that is cycling, rowing, a circuit of mixed movements, or a sport. Match it to your temperament.
Pro tip Lifters who hate monotony can build a varied 'road work' circuit; natural endurance types can happily grind one machine.
- 5
Track the trend over weeks and months
Measure HRV or resting heart rate consistently and watch the long-term direction. A steadily climbing HRV or falling resting heart rate confirms the aerobic system is adapting.
Pro tip Resting heart rate is easier to compare than HRV and moves in the opposite direction as fitness improves.
Watch out Judge by the multi-week trend, not any single noisy daily reading.
In the wild
Jamieson trained UFC champion Demetrious Johnson, the record holder for title defenses, on roughly two days a week of high-intensity sparring (Tuesdays and Saturdays). The rest of the week was technical drilling, skill work, and strength, not five days of all-out effort. This distribution let Johnson sustain an elite level and avoid major injuries across a long career, illustrating the 80/20 pattern applied to a combat athlete.
→ A dominant, injury-light career built on limited high-intensity exposure rather than daily maximal work.
A typical person trains four to five days a week, doing 30-40 minute low-to-moderate aerobic sessions on most days and two days of high-intensity intervals that push heart rate toward maximum. Jamieson states that if they do this consistently, their HRV will consistently climb. Most people fail not because the plan is hard but because they instead do three days a week of only the highest intensity for the shortest duration and neglect the easy volume.
→ Consistently rising HRV and improving aerobic fitness over months.
Common mistakes
Doing high intensity every session
The body can only absorb so much maximal work before it breaks. Constant high intensity leads to plateau, burnout, or injury rather than rising HRV.
Neglecting the easy, moderate volume
People chase the shortest, hardest sessions and skip the low-to-moderate work that actually builds the aerobic base and supplies stimulus without damage.
Training only two days a week for fitness
Two sessions can maintain strength but will not meaningfully improve aerobic conditioning or HRV; that requires four to six days of consistency.
Is it for you?
Best for
Non-professional trainees who want durable cardiovascular fitness, higher HRV, and long-term health.
Not ideal for
Athletes in a peaking block who need sport-specific maximal intensity work above all else.
From the transcript
“if you spend 80 percent of your time doing lower and moderate intensities... and then you spend 20 of your time in those higher intensity…”
“you can only do high intensity for so long before you break and you need something in between”
“it's consistency over the long term that produces results it's not how many times you can smash yourself in the gym in a week”
From the episode
An Expert Guide To HRV & How To Improve It - Joel Jamieson - #264
Joel Jamieson