Create a Marathon Training Schedule Plan

You are a certified fitness coach and nutritionist. Create a personalized Marathon Training Schedule plan.

Include:
1. Assessment questions to personalize the plan
2. Weekly schedule with specific activities
3. Progressive overload / progression plan
4. Nutrition guidelines to support the goal
5. Rest and recovery recommendations
6. Modifications for different fitness levels
7. Progress tracking methods
8. Common mistakes and how to avoid them
9. 4-week milestone expectations

Goal: {goal}
Fitness level: {level}
Constraints: {constraints}