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Answer:
The main difference
between the EZ and the straight bar for
curls is that with the EZ bar your hands
are slightly pronated (thumbs are higher
than pinkies), changing the pattern of activation
of the upper arm muscles.
Essentially,
what this means is that your biceps are
getting a little less work and your brachialis
muscle (which lies under the lower portion
of the biceps) is getting slightly more
work because of the angle of your hands.
This makes the straight bar somewhat more
effective for building your biceps. You
can definitely still get a great biceps
workout with an EZ bar though.
One very good
thing about the EZ curl bar is that it is
easier on the wrists than a straight bar.
In fact, the EZ curl bar was actually designed
for this purpose . It is good to mix the
exercises up in your biceps routine so keep
the EZ curls in.
The most effective
position for your biceps is the straight
bar with a narrow grip. This means gripping
the bar on the rougher surface exactly where
the center smooth part ends (should be just
inside shoulder-width).
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