When You Should Use Barbells Instead of Dumbbells (and Vice Versa)
by Beth Skwarecki from Lifehacker on (#5VSHF)

Dumbbells and barbells, the two workhorses of free weight training, each have subtly different advantages. Dumbbells are small; you hold one in each hand. A barbell is the longer, typically two-handed implement. Many exercises can be done with either one. So how do you choose?