When I look at a foot print on sand it is very clear to see that the main force goes to the heel and ball.

如果观察沙摊上的脚印，就可以清楚地看到脚底的受力点主要在脚后跟和脚前掌。

youdao

When I look at a foot print on sand it is very clear to see that the main force goes to the heel and ball.

如果观察沙摊上的脚印，就可以清楚地看到脚底的受力点主要在脚后跟和脚前掌。

youdao