3 minutes ago
You can create an effective drop-set simply by moving yourself at times, especially with cables.
As you re-position yourself, angles change and emphasize different parts of the muscle's range.
Normally you want to start with the muscle in its shortest position and work down from there.
So here I start low which positions my elbows higher getting the biceps shorter. Once I am fatigued, I stand up and change the angle which allows the muscle to take advantage of slightly different range and crank out a few more reps.