Stand up and hold the EZ bar down and in front of you with your arms relaxed. Your grip should be wide (more than shoulder-width apart) and palms facing up. This is your starting position.
Lift the EZ bar up until the it's just a few inches away from your shoulders and your forearms are almost completely vertical. Then, lower the bar back down but don't fully extend (straighten) your arms because you should always keep tension in your biceps for maximum effect.
Finally, repeat entire movement for the desired or prescribed number of repetitions.
Perform this exercise in a smooth and fluid motion
Don't extended your arms completely on the downward portion of the movement
Don't swing your upper body or arms in an attempt to lift the weight easier; this is cheating and does nothing for your biceps
SPECIAL NOTES & LEVEL of DIFFICULTY VARIATIONS
To increase the level of difficulty, slow down the movement or load more plates on the EZ bar.
The EZ bar is one of the most comfortable bar to grip and it's easy on the wrists. Thus, performing this exercise will feel good. One item to point out is to make sure you don't swing your arms up too much as it will only put unwanted pressure on your lower back and won't hit your biceps as much. Therefore, try to stay as stationary as possible when executing this movement.
One option is to stand up against a wall as this may help you to stay upright and avoid any cheating/swinging movement.