Nirvana. It hit me hard ten years later.

My kids bike derailleur, it’s off by two gears . I need to work with it one of these weekends

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It is both. Stretching is a kind process that prepares both your mind and your body for the work is coming ahead. It is absolutely necessary to get your body to produce the maximum output. It’s like having a small cup of tea before you force your heart rate to 190 (short of a heart attack,) Someone else mentioned , you have to warm up, then stretch. Then workout, then stretch as a cooldowm to achieve fficiency.