Does it really make a difference if one uses dumbells rather than a barbell? Yesterday whilst doing Pure Strength for Legs I couldn't pick the barbell up in front of me for plie squats, that's a first for me, obviously I was somewhat tired. There have been other times when I have a hard time getting the barbell over my head when I'm fatigued. So, if you're holding the same amount of weight does it really matter?