The impact of running is hard on the body, and it takes time for the leg muscles and tendons to adjust to the impact of running. While adjusting to the increased fitness demands of running can happen in just a couple of weeks, the changes in your legs is a much slower process.
And it is actually during your time off that your leg muscles and tendons get stronger - this is why it is important for rookie runners (those with less than 6 months running experience) to not run every day. It is fine to do lower impact cardio on your non-running days.
In addition to not running on consecutive days, it is also generally recommended that you take a rest day from exercise once a week or so. If this is confusing, perhaps an idealized schedule might be an example:
* Monday - running
* Tuesday - swimming and strength training
* Wednesday - running
* Thursday - cycling and strength training
* Friday - running
* Saturday - swimming and strength training
* Sunday - rest
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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