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upper body

상반신
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