The best way to improve your Yoyo intermittent recovery test score!
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Best way to prepare for a run is to run!!
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Focus on speed endurance, one method is Long and short interval training.
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Here is a recommended training program:

20m shuttle run
3 min x 1 t-36 shuttles
2 min x 2-24 shuttles
1 min 4-12 shuttles
30 secs x 6-6 shuttles
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Rest 1:1
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Ensure your physical competence before trying:

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