Respiration is an essential phenomenon in humans, and it also plays an important role during human exercise. Several studies have reported that inspiratory muscle fatigue (IMF) impaired sports performance, especially in endurance exercise. Several studies have proved that inspiratory muscle training (IMT) could enhance athletic performance in different sports. However, the duration of training period, intensity, frequency, and the under lying mechanisms of how IMT improving sports performance are not clear in depth. This review may provide evidence-based training methods for practitioners who apply IMT in a more scientific way.