The reason I started riding single speed: because it was cheaper than geared bikes. I also like the cleaner look because they are more simple. The reason I switch from ss to fixed: I wanted a change and everyone says it's such a good experience riding fixed. And it's true I love it.

Also, riding single speed and fixed has strengthened my legs a lot. I'm a fit guy and I work out upper and lower body, but nothing got my legs bigger and more toned than riding my ss and fg.