When most people hear HIIT (High-Intensity Interval Training), they think about burning calories, improving cardiovascular fitness, and getting a challenging workout in a short amount of time.

But there’s another reason to love HIIT: your brain may benefit from those short bursts of intensity, too.

Research increasingly suggests that high-intensity exercise can positively affect executive function, memory, attention, information processing, and neuroplasticity—the brain’s ability to adapt and form new connections. A 2024 meta-analysis of 20 randomized controlled trials found that HIIT was associated with improvements in information processing, executive function, and memory.

What Exactly Is HIIT?

HIIT alternates short periods of vigorous exercise with periods of recovery. For example:

• 30 seconds of hard cycling
• 30–60 seconds of easier cycling
• Repeat several times
• Recover and cool down

The beauty of HIIT is that the workout doesn’t necessarily have to be long. Research examining acute HIIT has found that sessions lasting roughly 11–30 minutes showed particularly consistent benefits for executive function.

And HIIT doesn’t have to mean jumping, burpees, or running. It can be performed on a bike, treadmill, rowing machine, elliptical, or with strength-based movements.

Your Brain Loves Exercise Too

One of the most interesting effects of HIIT is what it may do for executive function.

Executive function includes things like:

• Concentration
• Decision-making
• Working memory
• Inhibiting distractions
• Mental flexibility
• Problem solving

A systematic review found that a majority of the measured outcomes following a single HIIT session showed improvements in executive function, with particularly promising findings for inhibitory control and working memory.

That means your workout isn’t just challenging your muscles—it may also be giving your brain a little workout.

HIIT and Neuroplasticity

Another fascinating area of research is neuroplasticity.

Neuroplasticity is the brain’s ability to change and adapt in response to experiences. Research has found that exercise can influence the brain’s capacity for neuroplasticity, and studies specifically examining HIIT have found changes in areas involved in executive function and motor control.

Think of it as keeping your brain adaptable rather than simply focusing on keeping your body strong.

What About Memory?

This is particularly interesting as we get older.

A 2024 meta-analysis found that HIIT produced a small but statistically significant improvement in memory, in addition to improvements in executive function and information processing.

Research in older sedentary women has also found that an 8-week HIIT program was associated with improvements in overall cognitive performance, language, and visuospatial memory.

That’s one more reason to think about exercise as part of healthy aging—not simply weight management.

Your Heart and Your Brain Are Connected

Your cardiovascular system plays an important role in brain health.

When you improve your cardiovascular fitness, you’re also improving your body’s ability to deliver oxygen and nutrients throughout the body—including the brain.

HIIT has been shown to improve several cardiovascular and metabolic health markers, including aerobic fitness, blood pressure, cardiovascular health, and insulin sensitivity.

So when you’re working hard during an interval, you’re not just training your heart and lungs. You’re training a system that supports your brain, too.

You Don’t Have to Spend an Hour at the Gym

One of the biggest advantages of HIIT is efficiency.

You can get a challenging cardiovascular workout without spending an hour on a treadmill or elliptical.

And there’s some encouraging evidence that shorter, vigorous exercise sessions can produce acute cognitive benefits. A large review found particularly promising effects from vigorous activities, including HIIT and cycling, on areas such as memory, attention, executive function, and information processing.

Short doesn’t necessarily mean easy.

It means making your time count.

Fitness Influencer Spotlight: Kayla Itsines

If you’ve followed the fitness world for any length of time, you’ve probably heard of Kayla Itsines.

Kayla Itsines is a certified personal trainer and co-founder/head trainer at Sweat. She’s particularly well known for her high-intensity training style and has built much of her career around efficient workouts that can be performed with minimal equipment.

Kayla Itsines’ official website

She also has HIIT workouts available through her fitness programs, making her a great example of how interval training can be incorporated into a busy lifestyle.

HIIT Isn’t About Going All-Out Every Time

This is important.

HIIT should be challenging—but it should also be appropriate for your fitness level.

A beginner may need longer recovery periods and lower-impact movements. Someone who’s been training for years may be able to work at a much higher intensity.

That’s where individualized programming can make a big difference.

At Union Studio, workouts can be adapted to your current fitness level, goals, limitations, and experience. HIIT doesn’t have to look the same for everyone.

The goal isn’t simply to make you exhausted.

The goal is to challenge your body while helping you become stronger, fitter, healthier—and potentially supporting your brain along the way.

The Bottom Line

HIIT isn’t just about calories or sweating.

Research suggests it can support:

✔ Cardiovascular fitness
✔ Executive function
✔ Memory
✔ Attention and information processing
✔ Neuroplasticity
✔ Healthy aging
✔ Efficient workouts when time is limited

The research is promising, although the effects aren’t identical for everyone and scientists are still working out exactly how different HIIT protocols affect the brain.

So the next time you’re doing intervals and thinking, “Why am I doing this to myself?” remember:

Your brain might be thanking you, too.

Ready to Train Your Body AND Your Brain?

At Union Studio, fitness isn’t one-size-fits-all. We create personalized workouts designed around you, your goals, and your current fitness level.

If you’re ready to make your workouts more effective—and discover how the right training program can support your strength, fitness and healthy aging—

Let’s get moving!

Union Studio

Private Personal Training Studio
360 Kirman Ave, Reno, NV 89502
(775) 378-5551

Your body deserves a workout. Your brain does, too.