Contracting or posing muscles increases control over the muscle. Contracting in
between
sets can be used as a technique to further pump and fatigue the area being
worked.

Contracting and relaxing a muscle increases blood flow to an area which leads to
waste
product removal, these waste products to my understanding cause muscle soreness.


--- In LawrenceHosannahFanClub@yahoogroups.com, floor boy <floorboy_98@...>
wrote:
>
> i'm not a competing BB, nor am i a narcissist, so i
> practically NEVER actually FLEX my muscles. are there
> any benefits to flexing? does it strengthen the
> muscles at all, stimulate growth, enhance definition,
> ANYTHING??
>
> i've been working my legs more than normal lately and
> i notice that to get the "tired feeling" out of my
> quads i have to flex it out, is that peculiar to the
> quads or what (or just mine)