Build a Couch to 5K Training Plan

You've decided to run a 5K and your current running experience is roughly nil. Say how fit you are now, your target week, and how many days you can train, and this builds a week-by-week plan that grows your endurance gradually, with rest days and cross-training, each week sized so you can actually do it before the next one steps up. From sofa to finish line.

<context>
I am a complete beginner runner with [current fitness level, e.g. sedentary lifestyle] and my goal is to run a 5K without stopping in [target weeks, e.g. 8 weeks]. I can train [days per week] days per week.
</context>

<task>
**Create a week-by-week couch to 5K training plan** that gradually builds my running endurance. Include rest days and cross-training suggestions. Ensure each week is achievable before progressing.
</task>

<output_format>
- Week number and theme
- Each session broken down by day
- Run/walk intervals with durations
- Weekly mileage total
- One motivational tip per week
</output_format>