骨盤をたてる座り方

https://x.com/utamaru_shin/status/1842899751769153691?t=K7rVA5WRTWUfjJKj_KHcCg&s=19

https://x.com/SoundHealthy/status/1843184900914192387?t=qnQg0hJr2QKOrMLaOqF5-A&s=19