Ever do an exercise and notice that that particular muscle group seems to be quivering or trembling? Don't attribute it to the muscle itself, it is actually your nervous system recruiting thousands of neurons to engage during the exercise; this can also be referred to as neural adaptations.
Neural adaptations are most common in new and unfamiliar exercises in which the nervous system has not yet learned to handle and as you get more comfortable, and stronger, with the exercise the trembling will subside.
The tremor of truth is most seen in exercises involving a lot of muscles at once, such as planks, pushups, isometrics (exercises where you hold a particular form for a certain duration), and is also present in most suspension exercises such as a TRX tricep extension.
The goal here is to decrease the amount of quivering your body makes during exercise. The quivering wastes energy and also is distracting. Less quivering equals more efficiency.
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