When I was little, my mom taught me the art that is squatting when using a public washroom. As I got older, I basically said F-this-noise and began covering the seat with toilet paper and sitting instead. I couldn't be bothered to get a leg workout--relalistically, people--while trying to pee.
That said, I would never not at least wipe the seat so it always surprises me when people just run in and sit down. A friend of mine once did that without looking and sat in someone else's pee (ick!), so I always check.
Do you squat or sit? Are you diligent like me about wiping the seat?