Why does it matter when you breathe in Pilates?!
Breathing is co-ordinated with exercises so that exhalation occurs with movements that require the greatest effort. The diaphragm and transverse abdominis activate with the abdominal drawing in technique and their activation occurs earlier in expiration (Allison et al. 1998; Hodges et al. 1997). Therefore exhalation with the movement of greatest effort provides the spine with the greatest local muscle stability.