When you exert a force on an object, it exerts an equal and opposite force back on you. This is known as Newton's Third Law of Motion.

Here are some examples:

* Pushing a wall: When you push against a wall, the wall pushes back on you with the same amount of force, preventing you from moving forward.

* Jumping: When you jump, you push down on the ground with your feet. The ground, in turn, pushes back up on you with an equal and opposite force, propelling you upwards.

* Swimming: When you push water backwards with your arms and legs, the water pushes back on you, propelling you forward.

This principle applies to all interactions between objects. It's important to note that the forces act on different objects - your force is on the object, and the object's force is on you.