The key challenge of C25K is not your cardio fitness (this can increase pretty quickly with regular exercise), but rather the time it takes for your leg muscles and tendons to adjust to the impact of running.
Strength training works the muscles differently from cardio, and you can strength train at any time (including on running days), although it is best to avoid doing ST and cardio in the same workout session. ST should be part of any exercise program.
It is also fine to do lower impact cardio on non-running days, although a genuine rest day once a week or so is recommended.
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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