describe: Increase your stamina: To help you gain better stamina, lung breathing exercises can improve your breathing and help you feel better every day. EFFECTIVE AND USEFUL: Enhance your lung capacity and help you tone your abdominal muscles, the lung exerciser allows you to tone your core muscles. ADJUSTABLE RESISTANCE: The Deep Breath Lung Trainer offers you different resistance levels with adjustable resistance, making it easy for you to change accordingly. IMPROVE PHYSICAL PERFORMANCE: The lung breathing trainer is an excellent exercise tool for strengthening your breathing and abdominal muscles so you can enhance your overall performance. Lung Capacity Enhancement: Great for reducing the accumulation of body waste, the Lung Endurance Trainer will reduce the accumulation caused by body waste. Package contents: 1 piece of training device