My son and I are using these bands for calisthenics/ring work and we are find the quality and length of these bands ideal. I am quite heavy and ordered the number 5 & 6 bands. I personally have found that my strength and weight can not manipulate the number 6 band yet as it is so thick, but the number 5 has been perfect to help me with my rings exercises. I read many reviews of other band products and people mentioned that they wish the bands were longer so I went with these ones. These are perfect in length for me and my son who are 5ft7 and 6ft2. I have been very happy and will probably order the next sizes down when I am stronger and need less support on the rings than the 5 provides.