Diaphragm strengthening exercises can be performed while simultaneously engaging in cardio.
According to a new study, subjects who performed Inspiratory Muscle Training (IMT) while cycling demonstrated significantly higher activation of the diaphragm compared to subjects who performed IMT while at rest.
Conclusions
Considering how important the diaphragm is for injury prevention, endurance, and autonomic health, it is of little surprise that most coaches are advocating the use of diaphragm strengthening exercises. This interesting study suggests that in some cases, it may be more effective and time-efficient to perform these exercises during cardio rather than allot specific time during the rest of the workout to isolate these muscles.