Differences between muscular endurance and muscular strength lie in the amount of resistance involved and length of time during which a muscle works. In muscular strength, maximum force is exerted for a short time, and in muscular endurance, sub-maximal force is exerted for a longer period of time.
In practical terms, muscular strength is illustrated when the muscles act against a very heavy weight, for a few number of repetitions. Muscular endurance is illustrated when a lower weight is acted against for a higher number of repetitions. Due to the lengths of time involved, exercises for developing muscular strengths are often anaerobic, while those for developing muscular endurance are aerobic.