What is the best definition of muscular strength? the amount of weight you can lift regardless of your body size the amount of weight that your muscles can lift in repeated movements for extended periods of time
the amount of weight you can lift in comparison with your overall size
the greatest amount of force a muscle or muscle group can exert in a single effort

I think its the last one

Explanation:

the greatest amount of force a muscle or muscle group can exert in a single effort

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.