Kit

RESFIT™ Cardio Performance Kit

Performance-ready gear for training, recovery, and everyday movement

4.8 / 5

Built for athletes and active lifestyles

Compact, simple, and easy to use

Designed for training, recovery, and daily routines

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Easy Setup: Ready to use in minutes

Training Friendly: Built for consistent daily routines

Portable Design: Packs easily in a gym bag or travel kit

RESFIT Support: Backed by a 30-day guarantee

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Entrenador de respiración RESFIT™ - Edición Cardio In stock $29.99

Color

Negro

Estuche RESFIT™

In stock

$14.99

Color

RESFIT™ Máscara de entrenamiento - Atleta profesional

In stock

$54.99

Tamaño

Training guide

Control every breath.

Twist the dial and choose your load. Four progressive resistance levels train your diaphragm and intercostals like any other muscle — start light, breathe deeper, and level up as your lungs get stronger. Five minutes a day, anywhere. No apps. No subscriptions. Just measurable breathing power.

4 resistance levels — from beginner to elite

Stronger diaphragm in 4 weeks of daily use

Pocket-size: train at home, the gym or on the road

Start Training

VIRAL REVIEWS

Trained by those Who push limits

Athletes who train with RESFIT every day.

RESFIT gives you

More stamina.Faster recovery.Deeper sleep.Stronger lungs.

Five minutes a day of resistance breathing — the training method elite athletes use to push further, recover faster and sleep deeper.

Start Training

We change the lives of our athletes.

Peer-Reviewed Research

The Science Behind RESFIT

The RESFIT Breathing Trainer is built on Respiratory Muscle Training (RMT) — a method extensively studied in sports science and clinical medicine.

🔬 Research Transparency: The studies below examine the science of respiratory muscle training (RMT) — the proven methodology behind the RESFIT Breathing Trainer. While not conducted on the RESFIT device specifically, they demonstrate the well-documented benefits of resistance-based breathing training.

⚡

Endurance & Athletic Performance

Research on stamina, exercise capacity, and sports performance

3 studies

Journal of Exercise Rehabilitation

Effects of Combined Training with Breathing Resistance to Improve Endurance Capacity

Key Finding

Combined breathing resistance training with physical exercise significantly improved endurance capacity and respiratory muscle function in healthy adults.

PubMed Central · PMC3804987 · 2013 PubMed

Sports, MDPI

Effects of Respiratory Muscle Warm-up on High-Intensity Exercise Performance

Key Finding

Respiratory muscle warm-up using an airflow restriction device improved high-intensity exercise performance. Personalized resistance levels maximize benefit.

Thurston et al. · Sports 2015; 3(4):312 PubMed

Journal of Strength and Conditioning Research

Effects of Respiratory Muscle Training on Performance in Athletes: A Systematic Review

Key Finding

Inspiratory and respiratory muscle training increased athletic performance — with improvements in respiratory muscle strength, endurance, and timed trials across multiple sports.

PubMed · PMID: 31905644 · 2020 PubMed

🫁

Lung Capacity & Respiratory Health

Clinical evidence on lung function, COPD, asthma and respiratory health

3 studies

Pulmonology

Effect of Respiratory Muscle Training in Asthma: A Systematic Review and Meta-Analysis

Key Finding

Respiratory muscle training significantly improved inspiratory muscle strength and quality of life in asthma patients, supporting its role as a complementary therapy.

PubMed · PMID: 35843501 · 2022 PubMed

International Journal of COPD

Effects of Inspiratory Muscle Training on Dynamic Hyperinflation in Patients with COPD

Key Finding

Inspiratory muscle training reduced dynamic hyperinflation in COPD patients — a key mechanism behind breathlessness during physical activity.

PubMed · PMID: 23233798 · 2012 PubMed

Chest

Inspiratory Muscle Training Improves Lung Function and Exercise Capacity in Adults with Cystic Fibrosis

Key Finding

Adults with cystic fibrosis who underwent inspiratory muscle training showed improved lung function and greater exercise capacity.

PubMed · PMID: 15302725 · 2004 PubMed

💤

Sleep, Recovery & Cardiovascular Health

Studies linking RMT to better sleep, lower blood pressure and faster recovery

3 studies

Journal of the American Heart Association

Time-Efficient Inspiratory Muscle Strength Training Lowers Blood Pressure and Improves Endothelial Function

Key Finding

Just 5 minutes of daily high-resistance inspiratory muscle training lowered blood pressure and improved vascular function — with effects comparable to aerobic exercise and some medications.

AHA Journals · DOI: 10.1161/JAHA.121.020980 PubMed

Sleep

Inspiratory Muscle Training Improves Sleep and Mitigates Cardiovascular Dysfunction in Obstructive Sleep Apnea

Key Finding

Inspiratory muscle training improved sleep quality and reduced cardiovascular dysfunction markers in patients with obstructive sleep apnea.

PubMed · PMID: 27091540 · 2016 PubMed

Medicine & Science in Sports & Exercise

Inspiratory Muscle Training, Proprioception, and Chronic Lower Back Pain

Key Finding

Inspiratory muscle training improved proprioception and was associated with reduced chronic lower back pain — connecting respiratory function with core stability.

PubMed · PMID: 33049701 · 2020 PubMed

Trusted Research Sources

PubMed NIH · NLM Database ACSM College of Sports Medicine American Lung Association ATS American Thoracic Society AHAJournals American Heart Association

Eliminate Your Breathing Problems At Home

When breathing muscles such as the diaphragm become weaker, breathing efficiency drops — leading to faster fatigue and reduced performance. This can make physical activity feel harder and limit your endurance over time.

Just like any other muscle in your body, your breathing muscles can be trained. With consistent resistance training, you can strengthen your respiratory muscles and improve lung capacity over time.

An adjustable breathing trainer helps your muscles work harder with every breath. Short daily sessions — just a few minutes a day — can help build stronger breathing habits and improve performance over time.

Use it anywhere — home, gym, or outdoors

Ready to start training?

Join 80K+ athletes already breathing stronger.

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VERIFIED ATHLETES

REAL RESULTS.

Verified by RESFIT order system Only customers with a completed US order can submit a review · moderated within 48 h

4.9 2,400+ verified reviews

Verified buyer Photo by Jordan M.

JM Jordan M. Marathon Runner · Austin, TX 2 days ago

I started using this every morning before my runs and within ten days I could feel the difference. My breathing stayed controlled even on the hardest intervals. I use it on level 3 now and honestly it has become as essential as my shoes.

Recommends this product

Verified order #1847RESFIT™ Breathing Trainer

Verified buyer Photo by Tyler R.

TR Tyler R. Cyclist 1 week ago

Two weeks in and I am already breathing more efficiently on long climbs. It fits in any bag and takes seconds to clean. I use it while warming up on the trainer every morning.

Recommends this product

Verified order #1847RESFIT™ Breathing Trainer

Verified buyer Photo by Priya S.

PS Priya S. CrossFit Athlete 4 days ago

My recovery between rounds dropped noticeably after about three weeks. I was skeptical but the resistance levels let you progress gradually and that is what makes it actually work.

Recommends this product

Verified order #1847RESFIT™ Cardio Edition

Verified buyer Photo by Jhon T.

JT Jhon T. Basketball Player 3 days ago

Started using it before practice each morning. By week two my lungs felt stronger and I could push through the fourth quarter without losing my rhythm

Recommends this product

Verified order #1847RESFIT™ Breathing Trainer

Verified buyer Photo by Elena V.

EV Elena V. Swimmer 5 days ago

After a month of daily use my lap times improved and I am holding my breath longer between strokes. The silicone is comfortable and the resistance dial adjusts smoothly.

Recommends this product

Verified order #1847RESFIT™ Breathing Trainer

Verified buyer Photo by Ryan K.

RK Ryan K. MMA Fighter 6 days ago

Breathing under pressure is everything in combat sports. Five minutes before sparring and I can feel my diaphragm engaging properly. I have been training with it for six weeks and I am not going back.

Recommends this product

Verified order #1847RESFIT™ Cardio Edition

Verified buyer Photo by Logan. J

LJ Logan. J Trail Runner 9 days ago

High altitude runs used to wreck me. Six weeks with this device and the elevation just does not hit the same. Build quality is solid and cleanup is quick.

Recommends this product

Verified order #1847RESFIT™ Breathing Trainer

Verified buyer Photo by Chris D.

CD Chris D. Soccer Player 11 days ago

My second half stamina has genuinely improved. Setup took about thirty seconds, the instructions are clear and the different resistance settings let me push at my own pace. Great value.

Recommends this product

Verified order #1847RESFIT™ Breathing Trainer

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