Pec Fly / Rear Delt injin amfani biyu ne wanda ke raba kirji da kyau tare da hannaye da madafun iko masu daidaitawa.
Ta hanyar daidaita matsayin farawa da fuskantar injin, Watson Pec Fly / Rear Delt kuma yana ba da hanya mai kyau don ware kan baya na delts.
Gine-gine masu nauyi da nauyin kilogiram 100 sun sa wannan injin ya zama cikakke ga shekaru masu wahala a cikin dakunan motsa jiki masu ƙarfi.