Incline bicep curls

Set the bench to about a 45 degree angle (or even lower for more challenging reps)
Sit down on the bench and lean back with a slight arch in your lower back.
Hold the dumbbells and hang your arms downward so they are completely straight.
Breathe in and flex your core.
Breathe out and raise the dumbbells forwards by only bending at your elbows until your arms are just above a 90 degree angle.
Pause at the top.
Breathe in and start lowering the dumbbells for 2-4 seconds until your arms are completely straight. A deep stretch in the bicep is desired.