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기ꡬμμ΄ λ±μ΄λ λλ΄κΈ°(no equipment) - YouTube
https://www.youtube.com/watch?v=xQVQn6l6Iu4&t=817s볡근λ§λ€κΈ° 30μΌ μ±λ¦°μ§ 2ν (abs workout challenge 30days) - YouTube
https://www.youtube.com/watch?v=oqjC15Ew20A&t=294s
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기ꡬμμ΄ λ±μ΄λ λλ΄κΈ°(no equipment) - YouTube
https://www.youtube.com/watch?v=xQVQn6l6Iu4&t=817s볡근λ§λ€κΈ° 30μΌ μ±λ¦°μ§ 2ν (abs workout challenge 30days) - YouTube
https://www.youtube.com/watch?v=oqjC15Ew20A&t=294s