Training for a marathon and ready to level up? This 8-week Level 3 Base Building Plan is designed for experienced runners looking to sharpen their endurance, work on structured speed work, and build a strong foundation before jumping into full-on marathon training. Whether you're coming off a recent race or building back fitness after some downtime, this plan helps you get stronger, faster, and more confident—without burning out. What to Expect: We start with 60-minute runs and gradually ...