According to Newton's law of reaction, what occurs?

The principle outlined by Newton's law of reaction asserts that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on a second object, the second object will exert a force of equal magnitude and in the opposite direction back onto the first object. This law helps us understand interactions between objects, such as in physical exercises where one part of the body exerts force against another, and is foundational in both physics and biomechanics.

This concept illustrates that forces always occur in pairs; if you push against a wall, the wall pushes back with the same force. This idea is crucial in personal training as it informs the understanding of movement mechanics, balance, and stability during exercises. By grasping this principle, trainers can better convey how to perform movements safely and effectively, leveraging the body's natural responses to force.