Hi
For those of us with sore muscles I highly recommend the Omni Roller. It really gets into the muscle knots and avoids getting sore thumbs and knuckles, and is very portable (take it on holidays) and inexpensive enough to have multiples (ie keep one at home, one in the car and another at work). I'm buying more as presents for those who've tried mine and loved it). Give it a go!
Cheers
Chez