What is the difference between "muscular strength" and "muscular endurance"?

What is the difference between "muscular strength" and "muscular endurance"?

John Spencer Ellis (Author, TV Show Host, Trainer and CEO, National Exercise & Sports Trainers Association) gives expert video advice on: How do I design a strength training program?; How often each should I train each muscle group?; How much weight should I use when I train? and more...

Muscular strength is the muscle's ability to contract, to lift a given weight, whether it's one, two, five, or up to ten times, for example. Muscular endurance is the muscle's ability to contract at a sub-maximal effort for an extended period of time.