Need for the muscle on the operated knee auftrainieren by Thera bands. After the Theraband Assist is suboptimal for leg use, I needed foot straps. Therefore bought the Therabandfußschlaufen. Well - as a Glump (in High German: Geraffel, ...). Well - a lot of angry and cursed, since I four times must change the position of the loop (front, back, seiltich inside, laterally outward and over again). By Therabandfußschlaufen kannste forget. So look around for a replacement and found here. For Theraband very suitable priced even much cheaper, more stable and the metal solvent is to dimensions better than Plastikösen.