Arc – Originally Joseph Pilates created a Wooden “Spinal Corrector” as a supportive tool for mat moves. In more recent times the design and materials have been modified for ease and now the very light weight black foam “Arc” is offered as a ma move suppoort tool. The “Arc” has become a favorite tool for beginners as the structure easily supports the body in a variety of challenging mat moves and empowers people regardless of size and strength. The “Arc” can be used on the mat and on the reformer.