Muscular strength is defined as:

Muscular strength is defined as the ability of a muscle group to develop maximal contractile force against a resistance in a single contraction

Muscular strength and endurance are key components to physical fitness ... Muscular strength is defined as the ability of a muscle group to develop maximal contractile force against a resistance in a single contraction. Muscular endurance is the ability of a muscle group to exert submaximal force for extended periods.