Conferring of The Theraband

The exercises that I do (at the physio's) are mostly done using a 'Theraband' which is a broad elastic band  providing resistance to the muscles. How one ties the Theraband changes the strength of the resistance offered. I had been requesting my physio to disclose the store name and location from where I could procure a Theraband. He kept mum on 2 or 3 such occasions. However, yesterday he gifted me a yellow Theraband and taught me how to tie it around my ankles. I was on top of the world!