Hang your arms in a "ㄴ" shape between your wrist and elbow, with your fists facing each other. In a contracted state, slightly push your elbows forward while focusing on the relaxation and contraction of your chest. When you open your arms, make sure they do not go completely behind your shoulders.
Why is there no video of it? :/ makes it difficult to know if this is the right exercise
Where is the decline cable fly?
This also needs some additional explanation...!