O2Trainer Breathing Muscle Training Device | Lung Power & Endurance Tool for Athletes, Singers & High-Altitude Performance | Diaphragmatic Respiratory Trainer | 16 Resistance Caps

From the brand

DESIGNED BY UFC LEGEND BAS RUTTEN: Created by world champion fighter and conditioning expert Bas Rutten, the O2Trainer is built from real-world experience. It’s the same breathing tool Bas used to push his performance to elite levels—and now it’s available to help you do the same.
BUILD STRONGER BREATHING MUSCLES: Strengthen your diaphragm and external intercostals with just 30 reps a day. The O2Trainer helps expand lung capacity and boost oxygen efficiency during workouts, sports, or daily activity.
CUSTOMIZABLE AIR RESISTANCE TRAINING: Includes 16 interchangeable intake caps to adjust airflow restriction and increase resistance as your inspiratory strength improves—just like progressive overload for your lungs.
PORTABLE & EASY TO USE ANYWHERE: Lightweight, compact, and travel-ready—no batteries or apps required. Perfect for athletes, travelers, and anyone wanting to train respiratory power on the go.
PERFORMANCE ENHANCEMENT FOR ALL: Ideal for athletes, military, singers, hikers, and climbers. Whether you’re training for endurance, altitude, or voice control, the O2Trainer is your all-in-one breath trainer.