I think it's <span>C) Participating in sports
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The answer is kettlebell. Kettlebells<span> aren't anything new, but their popularity in fitness circles continues to rise—and with good reason. When used correctly, </span>kettlebells<span> are extremely effective </span>training<span> tools for providing total-body strength and conditioning. The problem is that </span>kettlebells<span> are often used improperly.</span>
Answer:
I believe that C is the answer
here this definition is similar to yours:
Muscular endurance is the ability where a muscle perform repeatedly without fatigue
The answer would be D because a doesn't make since then b and c increase so the answer has to be D