when you do your fly, are your arms stretched out wide in a horizontal manner?

You may want to try bending your elbows inwards to form a 90degree/45degrees(see which works better for you) angle upwards and then do your flys. You will be able to isolate the chest and make sure your biceps aren't getting the workload instead.

As for the presses, your triceps may be getting hit too hard. But normally this happens when you use a straightbar, dumbell pressees isolate the chest pretty well.
What you can do is bring the dumbells together when you press up and squueze the chest before lowering it.
Also make sure ur arms are in a horizontal parallel level with ur shoulders when ur lying down. Go wide as you lower the press, you'll feel the burn in the right parts in no time

This post has been edited by tineagle: May 9 2009, 10:38 AM

yup, remember good form > half motion heavy reps.

As for the flys, you will feeling the stretch as your arms go lower than your chest. So yeah, stretch out, feel the stretch on ur chest, then pull up