Muscular Strength

When we talk about muscular strength, we are referring to the ability of a muscle to exert a force on an object.

It follows then, that the more force we can exert on an object, the stronger we are.

Because F=ma (Force =Mass x Acceleration).....

Muscular Strength

In terms of the lifting, pushing, pulling movement patterns we associate with our training programs, it would mean that we are stronger than the next person if we can push, pull or lift a heavier object than that person ..ie we are capable of generating a greater force through our muscles.

For information about how to increase muscular strength, and a clear discussion of the different aspects of strength training (often called resistance training) refer to our strength training pages.

The term resistance training, in the world of gym- goers and personal trainers, refers to pushing or pulling or lifting anything that offers a resistance to the force exerted....

Wikipedia explains it here quite differently - which is cause for concern, and confusion!  
(I suggest you ignore that explanation)