This is the cornerstone of building the specific endurance needed to cover greater distances. Core work is non-negotiable.
Run Specific Endurance Training: Key Workouts and Recovery
This requires running at speeds that are faster than your comfortable pace. This could be structured as short, fast repetitions like 8 x 100 meters with full walk-back recoveries, or slightly longer tempo runs held at a "comfortably hard" pace where you can only speak in short phrases.
A successful long run should leave you feeling pleasantly tired but not completely drained. A slight stiffness that warms up with movement is normal; a nagging ache that worsens with each step is a warning sign.
Run Specific Endurance Training: Structured Workouts for Speed and Distance
This is when your body repairs micro-tears in muscle tissue and adapts to the stress you've imposed. Listening to Your Body Data from watches is useful, but it is secondary to the data your own body provides.
More About Tips for running faster and longer
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More perspective on Tips for running faster and longer can make the topic easier to follow by connecting earlier points with a few simple takeaways.