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Increased circulation to your injured body part helps bring in nutrients, oxygen, and cells that promote healing.
Relaxes tight muscles, causing tissues to relax.
Decreases pain caused by muscle tension or spasms.
Causes vasodilatation of the blood vessels, which increases circulation to the area.
Brings more blood to the area where it is applied. 
Reduces joint stiffness and muscle spasm, which makes it useful when muscles are tight.