Consider the tackle in American football. The force that the defender puts on the receiver’s body in order to bring him to the ground is equivalent to the force felt by the defenseman’s body during the tackle. You can’t initiate force without having a force put on you. For the tackle, this is very important. If the defenseman felt nothing there would be no incentive for him to be strategic in the application of his force on the receiver. And who would actually want to be a receiver if this were the case? If the guy who initiates the force feels nothing—much better to be him.
