Is there anything you can do to increase your chance of conceiving a baby boy?

No, well my sister tried the "If at first you don't succeed, try, try, try, try again" method and she finally had a boy, but she also has four girls. I don't really recommend that so no, you get what you get.

Answeryes!!! find out the day you are due to ovulate and have sex a day before or on the day of ovulation and these y sperm (boy) is faster then the x sperm (girl) and they will reach your egg first to fertilize it. Also find out what your pH range is because to conceive a boy the female has to be more alkaline. you can do this by getting pH testing strips off the net to test your saliva and urine. There cheap, i did this same thing and i paid 7 pounds altogether and that was with shipping aswell. i received them in two days. Go for it honey it does work!!!!!!
I believe the male sperm dictates the sex upon fertilization. Yes the female egg contains the XX chromosomes while the male sperm contains the XY chromosomes -if it will be a boy that Y is all that matters, so it's all up to that one little sperm- There is no proven food or exercise that will increase your chances of having a boy- nothing much you can do aside from genetically manipulating the sex of your child through in vitro etc...