Inthispaper,wepresentsimpleopportunisticrelayingwithdecode-and-forward(DaF)andamplify-and-forward(AaF)strategiesunderanaggregatepowerconstraint.Inparticular,weconsiderdistributedrelay-selectionalgorithmsrequiringonlylocalchannelknowledge.WeshowthatopportunisticDaFrelayingisoutage-optimal,that