Frustration of purpose has the effect of discharging the promisor from his or her obligation to perform, in spite of the fact that performance by the promisee is possible, since the purpose for which the contract was entered into has been destroyed. For example, an individual reserves a hall for a wedding.
Definition of shake for English Language Learners. : 1  to move sometimes violently back and forth or up and down with short, quick movements. : 2  to move or have parts of your body move in short, quick movements and in a way that you are not able to control.
Your body shaking during strength training isn't a bad thing. It just means that your muscles are working hard and are not used to the demands you're placing on them. Meaning they're just not strong enough yet. The trembling is caused by your muscles grabbing and releasing one another as they lengthen and shorten.