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Answer:
To be honest,
you can actually get a BETTER workout with dumbells
than you can with barbells. Of course, some
exercises are better than others as far as muscle
building goes.
Using your example,
the barbell bench press is actually a better
mass building exercise than dumbell flyes yet
dumbell bench presses, I find, are better than
barbell bench presses.
The reason is
that the dumbells force you to stabilize the
weight far more than barbells. This increases
muscle activation, thus working more muscle
mass therefore improving your results. This
freedom of movement is the main advantage of
the dumbell.
Barbells have
the advantage of stability, however, increasing
the amount of weight you can use compared to
dumbell exercises with a similar movement, e.g.
you can barbell bench more than you can dumbell
bench.
A good program
will take advantage of both barbells and dumbells,
mixing them up to work all aspects of the muscle.
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