Read additional research:
Respiratory training is well-documented scientifically. Take a look at the most relevant selection below.
The effect of 2-month training with an early version of Airofit
Effects of respiratory muscle training in healthy individuals
Effects of additional respiratory muscle endurance training in well-trained swimmers
Inspiratory muscle training improves rowing performance
Overview of respiratory muscles during
Inspiratory muscle training enhances pulmonary O2 uptake kinetics