"I've been using the Hetaru Respiratory Muscle Trainer for a few weeks now, and I can already feel the difference. The adjustable resistance levels make it easy to gradually strengthen my lungs, and I love that it works for both inhalation and exhalation. As someone who struggles with shortness of breath, this device has helped me improve my lung capacity naturally, without any medication. It's lightweight and portable, so I can use it anytime, whether at home or on the go. The different mouthpieces ensure a comfortable fit, and the included travel bag is a nice touch. Highly recommend for anyone looking to improve their breathing and overall lung health!"

John T.