• Breathing trainer designed to strengthen respiratory muscles and improve physical endurance. • Equipped with a calibrated resistance spring adjustable in 11 levels to customize training. • Inspiratory muscle training that uses variable resistance to strengthen the diaphragm and ribs. • Ideal for active people and athletes who want to optimize their breathing during exercise or daily life. • Includes nose clip, storage bag, 4 cleaning tablets and manual. • Helps reduce shortness of breath and improves general well-being after a few weeks of regular use.