I agree with Nanley - unless you have more than 12 months running under your belt, I'd stick with 3-4 days per week, to give you time off to recover from the impact.
If you stick with the same run all the time, you aren't really going to improve. Most runners looking to improve their running will mix things up a bit. eg.
* a long slow run once a week to improve distance.
* a 'tempo run' at a consistent fast pace,
* speed work, incorporating some much faster intervals, followed by some slower recovery intervals.
Doing a trail run using hills to add intensity is another way of mixing things up.
You only mention cardio, but strength training should be part of any good workout program. It gives you different benefits to cardio, and will actually improve your running.
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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