The impact of running is hard on the body, and it can take a long time for the body to fully adapt to that impact. Taking regular days off gives your leg muscles and tendons the chance to recover and get stronger.
I agree with Zorbs - until you have considerable running experience under your belt, keep your running to 3 days per week. However, it is fine to do other lower impact forms of cardio on your non-running days.
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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