Add resistance to standard strength-building exercises, like chest presses and squats. . Bands are also a great tool for increasing flexibility and range of motion while using your Terra-Core. Available in three resistance levels: foundation (12 Pound), Intermediate (30 Pound), and Expert (60 Pound). Each closed loop band is 41 inches long and is made from seamless latex rubber designed to resist breakage. The average length of the band is 41 inches.