Atemtrainer mit einstellbarem WiderstandBreathing Trainer with Adjustable Resistance for Lung Capacity Do you know the feeling after climbing stairs or a short sprint? Breathing becomes difficult, and you need time to recover. Strong respiratory muscles make the difference. This breathing trainer made of durable plastic systematically strengthens your respiratory muscles through adjustable resistance during inhaling and exhaling. With just a few minutes of daily practice, you improve your