Doing biceps curls with 15 - pound dumbbells won't help you too much. (fitnessandpower.com)
If you do biceps curls, it maintains your posture straight to perform the move correctly and to avoid the use of momentum (and it does not let you fall forward). (abmachinesguide.com)
Then I do 4 variations of biceps curls, but every training day is different. (dempseyfit.com)