Which fashion movement gained significant popularity in the 1980s characterized by fitness enthusiasm?

The option emphasizing activewear is correct as it identifies a fashion movement that surged in popularity during the 1980s, closely tied to the fitness craze of that era. This period saw an increasing societal focus on health and wellness, and as a result, there was a significant rise in the demand for clothing that was both functional and stylish in a fitness context. Activewear includes items such as leggings, gym shorts, and tracksuits, which were designed for exercise but also became fashionable for everyday wear.

This trend was heavily influenced by fitness icons and workout videos popular at the time, such as those featuring Jane Fonda, which inspired many to not only participate in fitness activities but also to adopt a related clothing style. The practicality of activewear, combined with its trendiness, made it a staple in 1980s fashion, reflecting the era's cultural emphasis on a fit and active lifestyle.