Gravity, the shape of the Earth, isostasy, moment of inertia . Gravity is one of the four fundamental forces (the others are the electromagnetic, the weak force and the strong force) and probably the least well understood. The basic concepts were formulated by Newton i n the 17th century. These were deductions from Kepler âs Laws of planetary motion.
Muscular endurance is an associated component of physical fitness. It has a lot of significance in sports as well as for general health. Muscular endurance is the ability of a muscle or a group of muscles to undergo repeated contractions against resistance for an extended period of time.It is associated with the muscle's ability to continue to perform without fatigue.here are two types of muscle fibers-slow twitch and fast twitch. Fast twitch fibers enable swift, short movements that last no longer than a few seconds. Slow twitch muscle fibers enable the performance of tedious, repetitive actions, such as climbing, rowing, running a marathon, etc.
Muscle endurance is different from cardiovascular endurance because it involves the muscle fatiguing rather than a limitation in the amount of oxygen being supplied or utilized by the muscles.