English version

the ball of the foot/hand

From Longman Dictionary of Contemporary Englishthe ball of the foot/handthe ball of the foot/handHBHthe rounded part of the foot at the base of the toes, or the rounded part of the hand at the base of the thumb ball
Examples from the Corpus
the ball of the foot/handThe heel of your leading foot should touch the ground, just before the ball of the foot and toes.However, I would suggest that you subsequently attack employing the ball of the foot rather than the injured instep.Calluses grow on the ball of the foot and do not have a nucleus.Raise your back heel and rest your weight on the ball of the foot.The jumping turning kick: strike with the ball of the foot, keeping the back leg tucked up.
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