In almost all basic action animations such as walking, running, and jumping, the shift of the character’s weight is a factor that cannot be ignored. Therefore, before conducting formal walking training, we need to understand the law of the character’s weight shift.

As shown in the figure, the lateral step movement can be divided into 4 parts: start, up ,contact, squash & pass. These 4 consecutive movements constitute a complete centre of gravity transfer process.

From this perspective, the ups and downs of the weight in the stride action are basically the same as in the walking action, and the four states from a motion trajectory similar to a sine curve.

https://syncsketch.com/sketch/Zjk1ZGM4OGM0/

Attached my Syncsketch work link.