Anticipation! - Principle 2

Anticipation is when a character prepares for an action to give the audience an idea of what's coming next and to make the action seem more realistic. For example, when a character is jumping, they prepare to jump before they actually do it, otherwise the energy would come from nowhere and this would seem unnatural. I liked this example as it shows anticipation but also shows arrows to guide you on how the different parts of the body can move at different times and it all doesn't travel the same speed. Another thing that I feel you would have to  consider is again the volume of the object or character as even when they are anticipating the action their volume has to stay the same at every pose.

See how the bird crouches before jumping into the air.