The Hundred is a dynamic thoracic flexion hold with rhythmic arm pumps and breath patterning (5 counts in, 5 counts out × 10 cycles = 100 pumps). It builds heat, increases respiratory efficiency, and trains global endurance while you stabilize the lumbopelvic region.
The Chameleon of Core.
An Observational Study Comparing People Practicing Pilates to Non-Active Controls