Lindo StretchMe Jelly Resistance Bands use a simple exercise to increase your flexibility, endurance, and strength. The low-impact continuous resistance helps tone and strengthen your body. It can be used to target specific muscle groups for total body conditioning. The StretchMe Jelly Resistance Band comes in 3 different strength levels, shown by the color. Light strength comes in pink, the medium strength comes in purple, and then heavy strength comes in blue.