Understanding the Three Breathwork Device Categories
Breathwork devices are not interchangeable — they train different physiological systems. Choosing the wrong category for your goal wastes money and produces limited results.
Category 1: Respiratory Muscle Trainers (IMT)
These devices load the inspiratory (and sometimes expiratory) muscles during breathing to build strength and endurance. The evidence base for inspiratory muscle training is the strongest in the breathwork device category — particularly for athletic performance and respiratory rehabilitation.
Best for: Endurance athletes, post-illness respiratory recovery, dyspnoea management.
Key devices: Airofit Pro 2.0, Airofit Active, POWERbreathe Medic Plus
Category 2: HRV Biofeedback Devices
These devices measure heart rate variability and provide real-time feedback during breathing exercises to guide users toward coherent, heart-rate-synchronised breathing patterns. The evidence base is strongest for HeartMath’s specific coherence training method.
Best for: Stress management, autonomic regulation, anxiety reduction practice.
Key devices: HeartMath Inner Balance, Lief Therapeutics
Category 3: CO₂ Tolerance and Breath-Pacing Tools
These devices use resistance or rebreathing mechanics to slow breathing, extend exhalation, and build tolerance to elevated CO₂. The evidence base is less developed than for IMT or HeartMath coherence training.
Best for: Nasal breathing retraining, over-breathing reduction, CO₂ tolerance development.
Key devices: Relaxator, Carbon Free Breathing Trainer
How We Evaluated These Devices
GreatHealthGear synthesises published breathwork and respiratory physiology research, independent reviews, and manufacturer specifications. We do not conduct our own device testing. Efficacy claims reflect what the research literature supports — not marketing claims. All respiratory contraindications are taken seriously.