The most challenging thing about learning to run is not so much the fitness, but the time it takes for your leg muscles and tendons to adapt to the stresses and impact of running.
If you feel you need to repeat a week a couple of times along the way, that's not a sign of failure, it's giving your body more time to adapt, and that's just smart.
Another smoother alternative might be to make each "week" 8 or 10 days long, and add an extra walk/run session in before progressing.
There's nothing rigid about a C25K plan - just keep following the underlying principles of walk and run intervals, don't run every day, and gradually ramp things up over time.
But certainly if you stick to it, you should be running well before Spring.
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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