Quote Originally Posted by SlowNA06 View Post

In a word: False.

When you do not give muscles ample time to repair, you will plateau, simply, because the muscle has not become stronger yet - it will be the same or a weaker muscle from the last time you did the exercise. Lifting does not make you strong. Eating then sleeping (then eating, etc) makes you strong.
next time your in the gym pick up a barbell and do some bicep curls and pay attention to the feel of your biceps and the angle of your arms. then do the same with dumbells. both work your biceps, so why just do one exercise? because they work the biceps differently. muscles don't perform just one motion. it's more beneficial to do a variety of exercises and switch of your routine from time to time. if u see a really fit guy walking by at the gym, ask him how many times he's changed his workout routine. i bet it's more than a few.