The agonists opposing muscle, the antagonist is being stretched in
the opposite direction (Think of it like the protagonist and antagonist in a
story line). The opposing muscle poses the potential to move against the motion
and force of the agonist muscle.
This is necessary for the body to perform such tasks as changing direction
and keeping the joints from receiving too much pressure or force from any one
direction. In the fitness world, this is more commonly referred to as the "push-pull"
concept.
There is a third type of muscle in this equation, referred to as the synergist.
This muscle type assists the agonist by providing additional force in the direction that
is attempting to move the body. This takes some of the load off of the primary mover
and more importantly the major joint that is helping to do the work. The role of the synergist
over time helps to minimize the wear and tear of the joints that aid in body
movement during both exercise and activities of daily living (ADL).
While you are making sure you consume the correct foods in your diet, also
be mindful of the role that the body's different parts are playing in the other
portions of your total weight loss program.