Pec Fly / Rear Delt na'ura ce mai amfani guda biyu wacce ke keɓe ƙirji daidai da hannaye masu daidaitawa da iyawa.
Ta hanyar daidaita matsayin farawa da fuskantar cikin injin Watson Pec Fly / Rear Delt shima yana ba da babbar hanya don ware shugaban baya na delts.
Babban aikin gini mai nauyi da tarin nauyin kilogiram 100 ya sa wannan injin ya zama cikakke na tsawon shekaru na cin zarafi a cikin gyms.