Muscular strength is the most amount of force that a muscle is able to generate in a single try. Muscle strength is different than muscle endurance, which describes how much power can be exerted over a longer period of time.
Any singular action where a person moves uses muscular strength. For example, someone pushing themselves up out of their chair, or moving something heavy like a rock is a muscular strength action. At the gym, one repetition of any barbell weight uses this principle as well. Those interested in measuring muscular strength use the measurement “1RM,” which stands for their “One Rep Max.” A person’s 1RM measures the most amount of weight that one particular muscle is able to move with one action. An example is if an athlete does a dumbbell bicep curl one time with a weight of 50 pounds, and that’s the most that they can do, then 50 pounds is their 1RM, and it would be the limits of their muscular strength in their bicep. According to the fitness sites, it’s a good idea to be careful about testing 1RM. This is because testing the upper limit of a particular muscle is often dangerous and risks injury to that muscle.