How to build aerobic capacity and recovery with Chris Hinshaw

Originally published on October 5, 2021

Aerobic capacity improves fastest when training matches your physiology, uses precise recovery, and teaches you how sustainable pace should feel. In Episode 143 of the WHOOP Podcast, Chris Hinshaw explains how he tests endurance limits, why heavy strength work still belongs in endurance training, and why recovery intervals deserve the same attention as work intervals. Hinshaw has coached 30 CrossFit Games champions, Olympians, professional surfers, and Brazilian jiu-jitsu world champions, and he draws on his own career as a world-class triathlete and All-American swimmer to show how better endurance work is built.

Note: This article covers WHOOP 4.0. For the latest hardware, see WHOOP.

To listen to episode 143 in full, head to the WHOOP Podcast on Spotify.

How do you know whether aerobic capacity is your limiter?

Aerobic capacity is a limiter when your speed drops too sharply as efforts get longer. Hinshaw’s approach is to compare performance in short, high-output efforts with longer, more aerobic efforts, then measure the rate of fatigue between them.

For running, he used a 400-meter effort and a mile. For rowing, he prefers a 1-minute test and a 6-minute test because both are relative max efforts. Over time, those pairings let him see whether an athlete needs more pure speed, more aerobic support, or both. Hinshaw said he eventually built a large enough sample to identify what “normal” fatigue looks like. In his running data, about 21.5% was a useful benchmark between 400 meters and the mile. In rowing, he put the average gap between a 1-minute effort and a 6-minute effort at 9.5%.

That framework also keeps coaching honest. Hinshaw gave Rich Froning as an example. If an athlete is excellent over 400 meters and fades too much over the mile, the answer is to improve the mile, not dilute the short-distance strength that already exists.

Hinshaw traced his own early success to unusual endurance traits:

“My VO2 max was naturally high, my ratio of slow-twitch fibers to fast-twitch fibers was really high, my lung capacity was 50% bigger than normal.”

What you should take away

• Aerobic capacity becomes easier to coach when short and longer efforts are tested together.
• A steep drop from a short test to a longer test often points to an aerobic limiter, not a speed problem.
• Hinshaw used a 400-meter and mile comparison in running, and a 1-minute and 6-minute comparison in rowing.
• Training gets more precise when the target is the actual weak point, not the quality that is already strong.

If you want to hear Hinshaw unpack testing aerobic versus anaerobic fatigue, listen to the full episode on Spotify.

Should endurance athletes lift weights?

Yes. Hinshaw argues that heavy strength work helps endurance athletes recruit more available motor units, which gives them more usable capacity when fatigue rises later in an event.

Once you know whether endurance is the limiter, the next question is whether the gym is helping or holding back progress. Hinshaw’s answer is clear: strength work belongs in the plan, especially low-rep, high-force lifting such as Olympic lifts, deadlifts, bench press, front squats, back squats, and cleans. His focus is less about bodybuilding and more about teaching the brain to access muscle fibers that otherwise stay dormant.

He also drew a useful line between plyometric and ballistic work. Rebounding onto a 20-inch box teaches quick reactions. Raising the box height and adding two 80-pound dumbbells creates far more risk, so the brain recruits a higher percentage of fast-twitch fibers. Hinshaw then likes to follow that kind of recruitment with a short sprint effort so those fibers learn to hold output longer.

His explanation of the mechanism is one of the clearest moments in the conversation:

“What we’re really doing is we’re training the brain to free up more of those motor units. Once they become freed up, we have a higher percentage available to us in whatever activity that we do.”

What you should take away

• Heavy lifting can improve endurance by increasing the amount of muscle the brain can recruit on demand.
• Hinshaw favors 1-rep to 5-rep strength work for this purpose.
• Ballistic work raises recruitment further because the brain senses higher consequence and higher force demand.
• Strength training is most useful when it supports the specific fatigue pattern that shows up in sport.

If you want to hear Hinshaw go deeper on motor unit recruitment and ballistic work, listen to the full episode on Spotify.

Why does recovery determine sustainable pace?

Sustainable pace depends on how well you recover between hard efforts. Hinshaw’s view is that many athletes misread an endurance problem as a speed problem, when the real issue is that fatigue arrives too quickly.

From there, Hinshaw moves to the variable many athletes under-program: recovery between bouts. He called fatigue the usual weakness in elite athletes and said rest quality should be manipulated with the same care as interval distance and intensity. If the target adaptation is recovery, then recovery has to become the focal point of the workout.

That means specifying whether rest is active or passive, how long it lasts, and how the athlete should move during it. Hinshaw’s preference is active recovery in the same movement pattern whenever possible. Runners jog. Rowers row easy. The goal is to clear fatigue while extending useful work, not drift through a vague break that changes the session from athlete to athlete. This is also where sleep, food, and recovery behaviors outside training start to matter. WHOOP members tracking those habits may also find useful context in nutrition and meal timing from Dan Churchill.

Hinshaw summarized the whole idea in one sentence:

“Your maximum sustainable pace is a relationship between your intensity and your recovery.”

What you should take away

• Recovery intervals should be programmed as precisely as work intervals.
• Active recovery can extend adaptation by clearing fatigue in the same movement pattern that created it.
• A pace problem often comes from slow recovery rather than low top-end speed.
• Sustainable pace improves when rest quality, duration, and movement are deliberately set.

If you want to hear Hinshaw unpack active recovery and sustainable pace, listen to the full episode on Spotify.

How do coaches teach pace and confidence at the same time?

The best endurance coaching teaches athletes how effort should feel, and it builds confidence through successful exposure to hard work. Hinshaw sees those two outcomes as part of the same job.

Once rest is treated as a training variable, the next skill is learning to hold pace without staring at a watch. Hinshaw wants athletes to recognize maximum sustainable pace by feel, especially in competition, where pacing choices happen in real time. He also believes athletes improve faster when they discover effort internally instead of being over-coached every second.

That philosophy is tied to how he writes sessions. A coach can crush someone with volume, but Hinshaw is after a tougher standard: designing work that feels challenging, reveals a new capability, and leaves the athlete more confident than before. He said the same insecurity shows up in teenagers and middle-aged athletes alike. The difference is that older athletes know the responsibility is fully theirs.

Hinshaw reduced the role of the coach to a simple standard:

“I think that coaches really are in the confidence building game. That’s what we do, whether you’re young or old, that’s what it’s about.”

That approach fits with other WHOOP coaching conversations on load management and performance choices and mental performance under pressure.

What you should take away

• Pacing by feel is a trainable skill, and endurance athletes should practice it before race day.
• Better coaching creates challenge with a clear purpose, not random exhaustion.
• Confidence rises when athletes complete work that once felt out of reach.
• Internal pacing awareness becomes more valuable as competition gets less predictable.

If you want to hear Hinshaw go deeper on pacing by feel and coaching confidence, listen to the full episode on Spotify.

What does WHOOP add to endurance coaching and recovery?

WHOOP adds context to recovery decisions by making HRV, sleep, Recovery, and Strain trends visible over time. Hinshaw’s point was simple: coaches need summaries they can interpret, not endless raw inputs.

That coaching approach also explains why Hinshaw values technology that summarizes recovery clearly. He said heart rate variability, or HRV, was barely part of mainstream coaching conversation before WHOOP made it easier to track and discuss. The value is not a single number in isolation. It is the historical view, the day-to-day pattern, and the ability to compare how a session felt with how the body responded overnight. For a fuller background on those signals, see what WHOOP measures.

Hinshaw also noted that too much raw data can slow decision-making. A coach still has to reconcile it, which is why he likes systems that summarize the important parts first. That same theme shows up in another coaching-focused episode on using WHOOP data with athletes.

His endorsement was blunt:

“No one talked about heart rate variability. And all of a sudden now, it’s commonplace. It changed everything in terms of recovery.”

What you should take away

• WHOOP is most useful when recovery trends are read over time instead of as isolated daily numbers.
• HRV became more practical for athletes once it was easier to track and summarize.
• Recovery, Strain, and sleep data are stronger when they are paired with training context and session intent.
• Coaches still need to interpret data against the athlete’s real limiter.

The bottom line

• Aerobic capacity training gets more precise when short, hard efforts are compared with longer efforts and the drop in speed is measured.
• Hinshaw used a 400-meter and mile comparison in running, and a 1-minute and 6-minute comparison in rowing, to identify fatigue patterns.
• Heavy 1-rep to 5-rep strength work can support endurance by increasing available motor unit recruitment.
• Ballistic exercises can raise fast-twitch recruitment before short sprint work teaches those fibers to tolerate output longer.
• Sustainable pace is shaped by both intensity and recovery, so rest intervals deserve exact programming.
• Active recovery can help clear fatigue in the same movement pattern that created it.
• Good endurance coaching teaches athletes to recognize pace by feel and leaves them with more confidence after hard work.
• WHOOP helps connect HRV, sleep, Recovery, and Strain trends to the pacing and rest decisions that drive endurance progress.

Frequently asked questions about things discussed in this episode

How does WHOOP help you spot when recovery is limiting endurance performance?

WHOOP shows Recovery alongside sleep and Strain trends, which makes it easier to see when fatigue is suppressing pace across multiple sessions.

What does WHOOP measure that matters for aerobic capacity training?

WHOOP tracks signals such as sleep, HRV, resting heart rate, and daily Strain, and those signals help frame how well the body is handling endurance work.

How does WHOOP help you manage active recovery between hard sessions?

WHOOP helps by showing whether the body is absorbing prior load, which can guide how much intensity and how much recovery work belong in the next session.

What does WHOOP do for athletes learning pace by feel?

WHOOP adds post-session context, so athletes can compare how a pace felt with how their Recovery and sleep responded afterward.

How does WHOOP help coaches individualize training?

WHOOP gives coaches a consistent view of recovery trends, which supports better decisions on load, rest, and session intent for each athlete.

What does WHOOP show after a hard endurance block?

WHOOP shows whether sleep, HRV, resting heart rate, and Recovery are stabilizing or drifting, which helps reveal whether the block is building fitness or accumulating excess fatigue.

For endurance work, WHOOP is most useful when you pair Recovery, Strain, and sleep trends with the pacing and rest decisions Hinshaw says determine maximum sustainable pace.