Branding

The tagline "JUST DO IT" is most famously associated with the sports footwear and apparel brand Nike. This slogan was introduced in 1988 and has since become a significant part of Nike's brand identity, symbolizing motivation and perseverance in fitness and athletics.

Options Analysis:

• Adidas: Known for slogans like "Impossible Is Nothing" but not associated with "JUST DO IT".
• Reebok: Known for "I Am What I Am" and other slogans, but not "JUST DO IT".
• Nike: Correct answer. "JUST DO IT" is iconic to Nike.
• Puma: Known for different branding and slogans, not "JUST DO IT".

Thus, the correct association is Nike.