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.
This stroke recruits the chest muscles, the lats, and other back muscles. Because this exercise requires rapid movement of the arms, going from above the head to down by the sides of the body, you'll tap into your fast-twitch muscle fiber potential, leading to improvements in speed and power.