dudes. need some help here. i'm an avid downhiller/mountain biker.

i'm quite skinny, around 52KGs with a height of 173CM?

i have no problems building muscles on my biceps, triceps, back or stomach but i'm having problems building up the chest region. i eat a lot, as in lots of protein and carbs. workout at least 3 times a week.

oh, and i can't afford gyms. i usually do lot's of pushups and pull-ups. i realised that the sides of my chest grows but not the mid section. :l

any tips for me? thanks. (:

yeahh. i do a variation of wide, mid and a narrow stance (the diamond shaped thingy). i'm not looking for a crazy build, just something to give a lil shape to my chest cuz that's the least muscular now. very un-proportional.

how many reps do you recommend?

thanks

i do 25 push-ups for 2 variation each set. 1 min rest between sets. around 5 sets a day. i sometimes put 5kg weight on my back though.

yeah and i do think it's genes too cause my family members are all skinny lol. and yes, not everyone can afford to go to gyms you know. :l