Yes4All Power Bands - Pull Up Assist Bands with 4 Resistance Levels &ndash; Ideal for Stretching, Strength Training, Chin Up, Powerlifting BUILD STRENGTH & IMPROVE FLEXIBILITY: Newbie or advanced users can use bands to exercise different muscle groups like Shoulders, Belly, Hips, Arms and Legs. Resistance band workouts increase strength, burn fat, lose weight, tone up & gain muscles PREMIUM QUALITY NATURAL LATEX: Constructed of continuous layers of tough latex for added resistance and sturdiness that wont break on excessive stress or deform. Ideal thickness and length allow you to work out more effectively 2.5 INCH RESISTANCE 60-175 POUNDS  EXTRA HEAVY (RED): Much more stiff than the others and do not provide as much stretch. Extra heavy bands are for strong athletes who want to build larger muscle groups, such as the legs, chest and back VERSATILE BANDS: These bands are not designed for Pull-ups only, they also work great for stretching, Pilates, squat flex and lateral walks. Incorporate bands into your daily cardio exercises, gym rings, doorway bar workouts for maximized results 1 YEAR WARR AND 60-DAY MONEY BACK PROMISE: Try and see for yourself without worries  you can always return within 30 days if you dont like it. We pride ourselves on superior customer support. If you have any problems, we're here to help Tone and strengthen every muscle group in your body. Easily adapt for multiple fitness levels by giving more or less slack on the band. Boost stamina, flexibility, and range of motion. Reduce injuries and keep your joints pain-free. Yellow  Very stretchy and take little effort to pull against and stretch out. Ideal to work shoulders and shins. Red  Much more stiff and do not provide as much stretch. Ideal for those who are very strong to train the legs, chest and back. Yellow  Very stretchy and take little effort to pull against and stretch out. Ideal to work shoulders and shins. Red  Much more stiff and do not provide as much stretch. Ideal for those who are very strong to train the legs, chest and back.