__________ is a strong feeling of wanting something.

The term that best describes a strong feeling of wanting something is "desire." This concept encompasses the emotions and motivation that compel individuals to seek out or attain specific outcomes, objects, or experiences. Desire is fundamental to human behavior as it drives decision-making and influences goals and aspirations.

In contrast, "timeline" refers to a schedule or sequence of events, rather than an emotional drive. "Goal" denotes an objective or target that a person aims to achieve, but it doesn't inherently convey the emotional aspect of wanting or longing. "Smart," while associated with intellect or cleverness, does not relate to the feeling of desire. Understanding the nature of desire is crucial in contexts such as physical education, where motivation can significantly impact performance and engagement in various activities.