i trained for a while at westside babell and never once saw someone perform negatives. strength is all about speed, so why would you want to practice slowly lowering the barbell on your eccentric phase? not to mention that most injuries occur during the eccentric phase.
here is a small exert from louie simmons,
We all know that one can produce more
muscle activation when lowering weight, up to 50% more. This is a good thing if you want added
muscle soreness. But who wants that? Most hypertrophy occurs when lowering weights. One can
lower more weight than one can raise. This is where the problem arises. Most tend to lower the
barbell too slowly, destroying the stretch reflex.



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