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There are absolutely no excuses for doing a standing or sitting cable fly. Despite what companies like Bowflex may tell you, the inherent instability of cables makes them imperfect for targeting muscles in a precise way, and the fact that you must stabilize yourself inhibits your ability to lift heavily and efficiently. Cable fly machines tend to force athletes to burn more calories simply stabilizing the cables than they do actually performing the exercise, a ridiculous trade-off that deserves no place in a decent exercise plan. Just use a barbell like everyone else.