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.