body build; someone's physique or figure (appearance of the body including build and proportions)
彼はスポーツ選手らしいがっしりした体つきだ。
He has a solid, athletic build typical of an athlete.
彼女は細い体つきだが、力は意外と強い。
She has a slim figure, but she's surprisingly strong.
服は自分の体つきに合わせて選ぶとよく似合う。
Clothes that suit your body type look better.