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.
In addition the thigh flexor muscles are also the primary muscle group responsible for sprinting speed-so by conditioning your thigh flexor for speed you will see dramatic improvements in your sprinting speed as well as your kicking abilities-even if you are already a top performer.he speed comes by conditioning the fast twitch muscle fibers in your leg muscles to perform what is called a 'fast twitch response' â which basically means to contract with speed and acceleration. The bottom line is you cannot condition your muscles for speed using the same techniques you use to train for strength.