Ideal for massaging the calves, thighs and back. I was surprised that this product is not recommended the US Triathlon Federation, that of Canada and not the IRONMAN Label, plus pro triathletes ..! As triathlete myself, I do not understand that such a product is not more than that recognized and recommended in FRANCE. It's amazing how this simple roll removes the nodes and muscle pain in the lower back .. I kept stretching to side and after two weeks I have noticed an improvement with more flexibility and less muscle soreness after workouts.