Kelly Testolin is a lawyer in Reno, NV who enjoys cycling for exercise. The document discusses different types of bicycles and their suitability for different riding conditions. Mountain bikes or durable models are best for riding on hills or trails, while single speed or fixed gear bikes work well for paved streets and bike paths. Single speed bikes allow coasting but fixed gear bikes do not permit coasting or pedaling backwards, requiring constant effort, though enthusiasts say this creates a sense of connection to the road.