We all want simple workouts that deliver results, and that's why the 21-15-9 format has become a staple in high-intensity functional fitness. Originally a CrossFit workout, it involves completing one ...
Have you ever noticed that two runs with the exact same pace can feel completely different? After five World Marathon Majors, a dozen half marathons, two Boston Marathon qualifying times, and years of ...
Most solid training plans include a weekly speed workout, often in the form of intervals. But the length of those intervals usually depends on your race distance, training goals, and fitness level.
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