Achieve your fitness goals and stay stylish with Gold, rose gold, black, blue, white, and red colored smartwatches and fitness trackers. Fitbit is a US-based fitness brand well-known for its range of smartwatches that aim to revolutionize how millennials look at their fitness. The brand has roped in Will Smith, Harley Pasternak, and Dean Karnazes as its brand ambassadors. Red is the single most dynamic and passionate color.