I saw the tip about exercising a bad back/leg/foot with a Pringles can and had to tell you my discovery. I had one of those leg problems and found that if I rolled a rubber nubby dog bone shaped toys under my foot, it not only relieved my leg pain but gave my foot a massage!! They can be found in any pet dept and are inexpensive too!
Source: My own discovery!!
By Terry R from Goodsprings