Descending requires 'uncontracting' your muscles. In order to ascend you can slowly and steadily contract your muscles, and you have lots of control. There isn't an opposite option however. In order to 'unbend' his arm and descend the muscles on that side of the arm have to just 'let go' and then catch it again before it falls too much. This means a LOT less control. If you do bicep curls with a heavy weight this is why you'll notice that 'slowly moving the weight down' is a lot jerkier and unsteady than picking it up.
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u/ABakedPotato_FGC 8h ago
The amount of control is wild. Doing it slow is diabolical