The Hundred is the quintessential Pilates exercise. The Hundred is a full-body exercise in which you vigorously pump the arms with 100 counts of breath (inhaling for five counts and exhaling for five counts).
Joseph Pilates designed The Hundred to be a warm-up, and traditionally it comes at the beginning of a Pilates session.
The Hundred is a very challenging exercise, but this tutorial breaks it down to be accessible for anyone.