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.
Muscular strength and endurance can be enhanced through weight, or resistance, training. Muscular strength is the ability to lift a maximal amount of weight for one repetition. This is similar to a one-repetition maximum bench press test. Muscular endurance is the ability to lift an amount of weight that is lower than the maximum you can lift as many times as possible. Muscular strength is built by performing only a few repetitions of an exercise, where muscular endurance is built by performing several repetitions of an exercise.