To perform the Zottman curl safely, please follow these steps:
Stand upright with a dumbell in each hand held at arms length. The elbows should be close to the torso
Make sure the palms of the hands are facing each other
While holding the upper arm still, curl the weights while contracting the biceps. Only the forearms should move. Your wrist should rotate so that your palms are facing up. Continue the movement until your biceps are fully contracted and the dumbells are at shoulder level
Hold the contracted position for a second as you squeeze the biceps
Now during the contracted position, rotate your wrist until your palms face forwards with the thumb at a higher position than the little finger
Slowly bring the dumbells back down using this grip
As you bring the dumbells back down, start rotating the wrist so that you go back to a palms facing up grip
Repeat until you can no longer maintain correct form
Alternatives
Tips
To perform the Zottman curl correctly, here are a few tips to help you:
Avoid swinging motions at any time
Perform this exercise under control, 2 seconds up and 2 seconds to come down