The Gait Guys make some good points in this post re: short term improvements in ROM. Bottom line is that you can easily create short term improvement but there can be a price for it if you haven’t added in the ability to safely use the movement. Which is to say we have the ability to go to end range without the risk of hurting ourselves which you may not have with the ROM that you gain through some of the quick fixes you can use. If you have range of movement issues it is likely to be a more complex issue and simply “flossing” to gain the movement is not the solution. This is not to say the bands are useless more that you need to think more about the why so that how you get there is more effective and long lasting.