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A popular myth has grown around the use of WD-40 as a joint lubricant and pain reliever for arthritis. The liquid is sprayed on the painful joint much as one would fix a squeaky mechanical hinge.
Rest until there is no pain. This may be a few days for a mild injury or two or three weeks for a more severe strain. If it is possible to use an exercise bike pain free then do so but if it hurts then wait. Medication. A doctor may prescribe anti-inflammatory medication such as ibuprofen to reduce pain and swelling.