Like if I clench my fists and muscles hard enough and imagine holding these weights, is it pretty much the same?
In: Chemistry
What you are describing is essentially isometrics, meaning you are holding statically. So clinching your fists and holding a weight is probably very similar.
But neither will likely result in actual muscle growth or strength increases. Study after study has show that it is the moving of the weights that actually produces such results. Both the part where you move against gravity(or whatever force) but also the part where you let the weight fall back down(as long as you do it slowly and control it) is what seems to produce muscle growth and strength.
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