There is no such position as Mayor of the United States (US). A  Mayor is typically a political position for cities and towns. The  United States is led by a president. Curr â¦ ently, the president is  Barack Obama.
Slow twitch muscle fibres are good for endurance activities like long distance running or cycling. They can work for a long time without getting tired. Fast twitch muscles are good for rapid movements like jumping to catch a ball or sprinting for the bus.
Well, it depends on what type of run you are doing. Each type of run (see below) works your muscles differently and and may target one group more than the other. Also, the type of muscles you have can make a big difference in which distance you excel at. Typically, people with a higher percentage of fast twitch muscle fibers do better at sprints and other things (weight training, etc) that require short bursts of energy.