Originally Posted by Tribex
Honestly opinion, and most disagree with me, expect those i've been able to physically prove it to.. But i think preacher curls suck. They are the worst. Scientifically, they dont make sense.
The bicep needs to contract against an oppossing force (load line) that is in line with the humerous. Only this way are the biceps contacting to full potential. Free weights can only direct their load one way: down, thanks to gravity. If you look at a preacher bench, when you arm is resting on it, your humerous makes a 45 degrees angle downward. This compared to the 90 degree angle of the load line (freeweight) does not match up. Hense, your not working it any better than a seated dumbell curl will hit it. Only reason people get good results from preachers is because the arm is supported, and more support means more isolated output, which means more growth.
Just my opinion, ignore it if you'd like.
On the other hand, lookin good bri, you've made great progress. keep up the hard work and even more results will be on their way.