Assuming a 2x split, there are 3 exercises which form a perfect twice weekly routine- mild decline dumbbell, incline barbell or dumbbell (safety issues more than anything else), and flies of some sort to, as you said, stretch things out a bit. Decline can be performed one session of the week, incline can be performed in the other. Flies can be included each session for sake of flushing, stretching, etc.
The reason: The IEMG studies conducted by Tudor Bompa and Leo Cornaccia Jr. suggest that the decline dumbbell bench is the most effective for pec major. Incline bench is a necessity for developing the ridge of pectoralis mass which runs along the clavicle and originates at the sternum thereby creating that flat, square look that is desired. The decline bench exercise tends to build the overall mass of the lower pec which gives the 'pec nearly touching biceps' appearance which is highly regarded in bodybuilding.
Flat seems to be fairly effective for creating pec mass when dumbbells are used though the IEMG numbers suggest that it is less efficient than decline dumbbell. The primary benefit with decline is the absence of major anterior deltoid effort in the lift- the lift is primarily chest and triceps barring some negligible ancillary stabilization from other muscle groups.
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