He turned his upper body backwards then used all his strength to pull his foot forward.
この場合、次のような言い方ができます。
ーHe turned his upper body backwards then used all his strength to pull his foot forward.
「彼は上半身を後ろにひねり、全力で前に足を引っ張った」
後半部分を次のように言うこともできます。
ー ..., then he thrusted forward with all that he had.
「そして全力で前に押し進んだ」
ご参考まで!