Heels not only have to be the right height but in the right position: not too far back, but under the centre of the heel so they support your weight properly, following the natural line of your body.

鞋跟不仅要有一个合适的高度，也需要在正确的位置上：不能太靠后，要在脚后跟的中心，这样的鞋跟才能沿着你的身体曲线有效地支持你的体重。

youdao

The C-shaped back keel releases energy to make the gravity centre of a human body rapidly transferred in the transition time from touchdown to weight-bearing period.

由着地期向承重期过渡时C形后龙骨释放能量使其人体重心迅速转移。

youdao