Muscular force can be adjusted to match different loads by

The rate at which the motor neurons action potential are acting using more and larger motor units embed over the neurons that'll ultimately trigger the contraction of more muscle fibers according to different kinds of load.

i think life is life. many could argue that life is ‘nice’ or ‘fun’ but in the end, it is immaterial and will end. nihilism is my philosophy. nothing matters in the end so why make an effort?