It’s all the same, with variations

Suppose objects moved randomly. Apples not only fall to the ground, some swing sideways. Some jolt up. And others detach from the branch and remain in the air. In a world where the laws of motion are inconsistent you wouldn’t be able to play tennis. Or any sport. Your body’s movements would behave randomly as well. You intend to run but end up walking backwards.

Reality is simpler. The laws of motion work the same across everything you do. Across all space. When you pick up a book, wave your hand, or push a shopping cart, the nature of movement doesn’t change. It’s always the same. Differences are mainly caused by direction, spin, angles, speed, and the shape and mass of objects we interact with.

The motion of your body is affected by the space between you and the contact point. Closer to your body, less space to move. When it’s just right, it’s as if you swing freely through air. See a person swing without hitting the ball, and you’ll notice their arm moves naturally.

Your arm can accelerate faster for some shots and slower for others. You can put all of your mass into a shot or a part of it. All these factors are just different numbers in the same equation. The ball doesn’t do its own thing. Its motion is an expression of your input. It follows the instructions of your body.

So different properties interacting with each other is what makes it all appear diverse. But none of it is random. They follow the same laws of physics. It’s very simple and elegant. A person playing from the service box is doing the same thing as a person playing from the baseline. A player just learning tennis is also doing the same thing as a pro player. Playing with motion.

What this means is that we can understand the why behind any shot. The ball’s trajectory is always expressed by your movement. Its direction and momentum are given by the way you move your mass. So, the question to always return to is whether the body is working together or in conflict. The deeper and more precise the connection, the better the motion.

A person learning for the first time already knows to swing to hit the ball. They know to swing in the same direction they want the ball to travel. Every person throwing or kicking the ball does the same. Motion is intuitive to us. Just as it is for a bird to fly.