You might think of exercise balls - sometimes called yoga balls - as a relatively recent innovation. Truth is the idea of a tough rubber ball dates back to the early 1960s when an Italian plastics manufacturer first made what it called "Swiss balls." Early on, they were used primarily during physical therapy for neuro-developmental treatment. Over time, they were found to work more muscles than exercising on a hard surface, so they were integrated into yoga and pilates routines. This exercise ball from URBNFit is available in several different sizes and colors and includes a pump, extra plugs and a workout guide.