Constant tension for a chest that pops.
Keep the elbow bend locked. Think of hugging, not pressing.
Set high and swept down toward your hips, the crossover keeps the cables pulling against your chest through the entire arc, from the wide stretched start to the squeeze in front of your body where dumbbell flys go completely slack. That fully loaded finish is the whole reason the movement exists. The front delts assist through the sweep, but the hug is chest property.
The pull direction. High pulleys swept down toward the hips emphasise the lower chest line, low pulleys swept upward bias the upper chest, and shoulder height hits the middle. This version runs high to low.
Dumbbell flys lose almost all tension at the top when the weights stack over your shoulders. The cables keep pulling sideways the whole rep, so the squeeze at the end actually costs something. For flys specifically, cables are the stronger tool.
Set a soft bend at the start and freeze it there. If the bend increases as you fatigue, you are pressing rather than flying, which usually means the stack is a couple of pins too heavy.
