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Try holding a fist as tight as u can, and latterally moving your wrist. U may notice shaking, reduced speed, and possibly pain. This is what aiming with tension is like. This is the main cause of tendonitis injuries. U can do every stretch in the world, but it wont fix bad habits
The tendons that move your fingers are strings that go back to your forarm. Anytime u are activating your fingers, its pulling on all of those tendons which puts pressure on your wrist, and everything in that area, especially when you latterally move your wrist.
The less strength you use to grip your mouse, the less pressure you are putting on your wrist. And it also means your extensor tendons need to compensate less to hold your clicking fingers up, which recuses tension further, improving control, clicking speed, and speed overall.
Another thing to consider is your downward force on the mouse. Some people often push down on their mouse in order to gain more control. But this is a begginer habit to compensate for a lack of muscle control. Too much downward force can cause shaky aim and shoulder pain.
Too much downward force applys more friction, which means your mouse actually requires more force to be moved, reducing speed, and increasing your over all effort, and accelerating fatigue.
