Force can be a wide range of things!Force is the interaction between two objects.Force is to make a way through or into by physical strength, breaking open by force.
A FORCE is a push or pull upon an object resulting from the objects interaction with another object. Whenever there is an interaction between two objects there is a force upon each of the objects. When the interaction ceases the two objects no longer experience the FORCE. FORCE can only exist as a result of an interaction.
To get deep into force would be to have a understanding of physics and the wide range of FORCE! Gravitational pull,contact force,Action at a distance force are just a few type's. Knowing this would then bring us to the Newton of FORCE in which we could measure the quantity of FORCE.That brings us to the state of FORCE, Newton first law of motion tells us that an object at rest stays at rest and an object in motion stays in motion. There for when you have the hound weight pulling that's a type of FORCE, running is a type of FORCE! Now as I stated if you bring them to a shallow part of a watering hole and have the chase the flirt pole the interaction between the two objects (Dog&water) is were FORCE would come into play! This is why the free spinning keep builds a much leaner hound with great wind . In a free spinning keep its less force on the hounds as they don't have to pull or push anything as they are more so just keeping up with a machine or bike! Swimming is also a form of free spinning keep as its not as much FORCE placed on them.