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My right Pec is not as developed as my left, i have no idea why, i make sure i don't emphasise more on either side when working out. I've started doing single arm things on the right (Flat bench dumbell and flys etc.) but this is not giving any visible improvement. Any suggestions greatly recieved.

are you right or left handed? I have a little bit of the same problem. I find the problem falls on your grip strength and how your body know how to flex when you do push type movements. Try working on flexing your right pec more. For example, do cable flies, and when you come down and bring your arms together, close your eyes and think about specifically flexing your right side, more so on the grip and chest. do that for all sets and really try to visualize the connection between your grip and flexing your chest.

Yes.

It is possible for your body to prioritize loading more strongly on one side than the other without you being aware of it. The grip connection is a good point that I never thought of.

Unfortunately, it is also possible for your chest muscles to be genetically assymetrical. When you train it just becomes more pronounced. I still suspect you can even them out in this case.

I have no idea if this is a good idea; it is just something I have heard of:
Uneven barbell loading. Purposely putting a little more weight on one side. Sounds dangerous, but you'll be expecting it.

A slight difference, say 5 pounds, will make it feel like the majority of the load is on your week side. The trick would be to concetrate on bringing the bar up completely parallel, never letting it dip on the weak side.

This could also help "train" your body away from the uneven priority in load if that is the case.

I've heard of this on things like presses and barbell curls. NEVER on squats or deadlifts.

Again, this is just something I've heard. I've never tried it. The others may have some info or opinion on the practicallity of this.

Try masturbating more.

how did I know you were going to say that.

I switch hands to keep even :D

I'm naturally right handed, and this is my stronger side (so i feel). I'll try loading the bar unevenly when is bench, but should i do this from the get go, or at the end of a session as an "extra" thing as i have been doing in trying to correct it?
As for the masturbating thing, nice idea, but its the side i use any way!

I would do it from the get go.

I think choking the chicken works arms and shoulders more than chest

For Pete, maybe just wrist.