In which scenario might "grueling" tasks often be found?

The term "grueling" refers to something that is extremely exhausting and demanding, often requiring considerable effort, endurance, and stamina. High-intensity training or competitions typically involve such challenging tasks that push individuals to their physical and mental limits. These scenarios are characterized by intense exertion and require sustained effort, making them appropriate for the term "grueling."

In contrast, relaxed and leisurely activities do not typically involve exhaustion or high demands. Routine office work with little pressure suggests a more comfortable and manageable environment, while simple household chores generally do not pose significant challenges that would render them as "grueling." Thus, the context of high-intensity training or competitions aligns perfectly with the definition of "grueling," highlighting why this scenario is the most fitting choice.