Joe Pilates said that The One Hundred “oxygenates” the body. He believed Pilates increased circulation and was like an internal shower. A family member of mine had a pulse oximeter measurement (SpO2 – pulse oxygen saturation) of 86 (she has a lung condition). She then performed the One Hundred breathing sitting up (without pumping the arms, since she had an arm injury) and her pulse ox measurement rose up to 98! She also felt warmer. A different person’s pulse ox also rose from 94 to 99 after performing the One Hundred breathing. A different person started at 89 and ended up 98 after performing the One Hundred breathing. The pulse oximeter measures hemoglobin saturation (The percent amount of HBO2 in total Hb in the blood) .