Chest fly machine 3 variations targeting upper and middle and lower chest muscle. The chest fly machine, also known as the pec fly, machine fly, or pec deck, is a piece of gym equipment specifically designed to target the pectoral muscles in the chest. It is particularly beneficial for both beginners and experienced lifters due to its ease of use and ability to isolate the chest muscles effectively. The primary muscles targeted during a chest fly are the pectoralis major and minor. The pectorali