you should be able to load up the barbell and go a lot heavier than you would doing a regular bicep curl. If you don't want to stray too far from your regular dumbbell curls, the hammer curl is an ...

Stand with your feet shoulder-width apart, holding a barbell with an underhand grip. Keep your elbows tucked at your sides and curl the barbell toward your chest. Squeeze your biceps at the top ...