このイラストのポーズは、壁に背中を寄りかからせて座り、脚を大きく広げて両手を頭の後ろに上げたリラックスしたストレッチポーズです。開放的で爽やかな印象です。
The pose in this illustration is a relaxed stretch, with the person sitting with their back against a wall, legs spread wide, and arms raised behind their head. It gives a liberating and refreshing impression.