My usual bench is 170 but for some reason my Tris have been fatiguing faster than normal, im thinking its my form. can anyone give me any insite to this problem
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I may be crazy....but you aren't working your triceps on days prior to your bench press days? If so they'd fatigue much quicker.
Maybe try doing some hard tricep work the day AFTER your regular chest workout. Really isolate them and go heavy. Then give yourself 4 days off from chest/triceps before you attempt to bench press again. This may give your triceps some extra power & endurance.
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