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.
Fast-twitch muscles. Fast-twitch muscles use an 'anaerobic' metabolism to create fuel and need more oxygen, and they are much better at generating short bursts of strength or speed than slow muscles, such as a 100 metre sprint or weightlifting, but they tire more quickly.
Therefore, slow twitch fibers are great at helping athletes run marathons and bicycle for hours. Fast glycolytic: Fast glycolytic or Type 2b are also fast twitch white muscle fibers but these muscle fibers have a very low tolarance to fatigue and need a high period of recovry after use.hey are different type of muscle fibres (US spelling Fibers). Fast twitch are good at contracting fast but fatigue quickly. Slow twitch contract more slowly but do not fatigu â¦ e as fast.