Hit a front double biceps pose with real load behind it.
Keep your elbows pointing out to the sides, not drifting forward.
With both pulleys set high and your arms out in a T, this curl puts your biceps in their shortened, elevated position and makes them contract hardest right at the peak, exactly like hitting a front double biceps pose against a loaded stack. The overhead arm angle biases the squeeze at the top rather than the stretch at the bottom, which is why the contraction feels so different from standing curls. It earns its spot as a peak-contraction finisher that makes arm day end on a pump.
With your arms raised to shoulder height the biceps start partly shortened, so the hardest part of the rep is the fully squeezed top position. Standing curls load the stretch, this loads the peak.
At or slightly above shoulder height, so your upper arms sit level in the T with tension already on the cables at full extension. Too low and the start of each rep goes slack.
Yes, drifting forward turns it into a pressing pattern and unloads the biceps. Keep your elbows pointing out to the sides and imagine curling toward your temples, if you can't hold that, lighten the stack.
