START: This exercise is similar in execution to the flat-bench flye, except that here your body works harder to keep you stabilised. Grab two dumbbells and lie back on a ball so that you face the ceiling. Extend the dumbbells out to each side of your body, maintaining a slight bend in your elbows to protect them from hyperextension. MOVE: Without altering the angle in your elbows, bring the dumbbells up in an arc toward each other, stopping just short of touching over your chest. Lower them back along the same path to the start. To get more upper-chest emphasis, lower your hips toward the floor and perform in the same manner.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.