I agree, get it checked out. it can be a variety of reasons from injury, age, arthritis, to whatever. Give yourself a day to rest and recoup once per week. Try a different kind of exercise. Swimming, walking are lower impact and may help it to feel better.
"Pain is temporary. It may last a minute, or an hour, or a day, or a year, but eventually it will subside and something else will take its place. If I quit, however, it lasts forever." -Lance Armstrong
"One tiny little thing can spark an idea. Inspiration can come from anywhere." from a magazine.
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