Factors are based on:
Muscle? “A”- Strength referring to the ability to exert a force on an external object?
e.g. lifting a weight.
Muscle? “B”- Strength referring to the force exerted by the muscle itself?
e.g. on the place where it inserts into a bone.
Muscle? “C”-Strength of muscle based on its weight?
e.g. pound for pound strength.
I would agree that are strongest muscle would be our “Heart”, the heart is autonomic and generates a beat on it’s own (one of the main reasons we need calories), however, the answer that I think you’re looking for are our abdomonials (core). They Keep us upright and give us the ability to move in all planes as well as the ability to lift and generate force.