The impact of running is hard on the body, and is something you should work up to gradually. It takes time for your leg muscles and tendons to adapt to the impact of running.
Before running you should build up a solid base of walking, then transition into running through a Couch to 5K program (which work through progressively increasing intervals of running and walking).
Shin splints and muscle soreness is the more normal result from trying to run too far, too fast, but bursting some small blood vessels in the lower legs (and thus associated bruising) is possible.
Build up to running gradually.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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