<P> Prior to state sanctioning , weight classes were not mandatory since the competitions were held without the approval of the athletic commissions . For instance , the Ultimate Fighting Championship introduced two weight classes at UFC 12 : heavyweight , which grouped competitors above 200 lb ( 91 kg ) , and lightweight , which grouped competitors under 200 lb . </P>
<P> Prior to state sanctioning , weight classes were not mandatory since the competitions were held without the approval of the athletic commissions . For instance , the Ultimate Fighting Championship introduced two weight classes at UFC 12 : heavyweight , which grouped competitors above 200 lb ( 91 kg ) , and lightweight , which grouped competitors under 200 lb . </P>
when were weight classes introduced to the ufc
when were weight classes introduced to the ufc
at UFC 12
at UFC 12