PBR PRO SPORTS RUB works in a progressive format, heating up as you get active and returning to normal temperature when activity ceases. PBR PRO SPORTS RUB should be applied before any physical activity such as working out/training, walking, running, any sports related activity, or just normal work around the house. At first you will notice a slight warming effect on the muscle or joint where you have applied the lotion. As your muscle warms up so does PBR PRO SPORTS RUB, keeping the muscle heated to encourage blood flow thru the muscle. PBR PRO SPORTS RUB continues working for several hours after physical activity has ceased, though you may not feel any heat. PBR PRO SPORTS RUB provides relief without any activity, though it may not heat up. The heat is not necessary for relief of pain, stiffness or swelling