The most challenging thing about running is not so much the fitness, but the time it takes for your muscles and tendons to adapt to the impact of running.
An exercise bike is very low impact, so walking (which is moderate impact) is actually better preparation for running than cycling.
I totally agree with the recommendations on this thread for Couch to 5K plans as the best way to transition into running. These programs work through progressively increasing intervals of running and walking, and give your body the time to gradually adapt to the impact.
However, most experts recommend keeping your running to just 3 times per week until you have 6-12 months running experience under your belt. An exercise bike can be a great way to cross train with a lower impact 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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