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upper body

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Keep your upper body straight.

Ask Well: Squats for Aging Knees

The Phys Ed columnist Gretchen Reynolds responds to a reader who is concerned about her painful knees.

https://archive.nytimes.com/well.blogs.nytimes.com/2013/01/25/ask-well-squats-for-aging-knees/#:~:text=Keep%20your%20upper%20body%20straight.%20