How do the training techniques of muscular strength and muscular endurance development differ?

Strength vs. Muscular strength is determined by how much force you can exert or how much weight you can lift. Building muscular strength uses heavier weights for fewer repetitions. Muscular endurance refers to the ability of a muscle to sustain repeated contractions against resistance for an extended period of time.

a1 = unhealthy

a2= healthy

a3= healthy