What is the ability to contact a muscle, or group of muscles, repeatedly without getting tired

Muscular strength is the amount of force you can put out or the amount of weight you can lift. Muscular endurance is how many times you can move that weight without getting exhausted (very tired).

Explanation:

It would be muscular endurance because thats how much/many times you can move until becoming tired. You build endurance the more you train/practice that muscle group!

Hope this helps :)