As ROS stated the only way to get better at doing them is to do them. You said do did a lot of lifting of heavy things and pulling heavy objects. Neither of these things really hits your chest. Remember muscles pull, so to use your chest you have to do movements that act to bring you arms from your sides (parallel to the floor) to your front. One approach many people use when attempting to build up for an academy is to do a set to failure during commercials while watching TV, I normally did 5-6 commercials. Since you say you can't do one push-up, I'd probably start with the modified on you knees type for the first week. Then the next week do as many normal push-ups as you can do then do the modified style to failure. I would continue this until I could do 10 regular push-ups then drop the modified ones. If you are sore form a previous workout then don't do another one until you are no longer sore. I would shoot for 3-4 days per week.
As far as pull-ups go a lot of people have problems with those. If you have a work-out partner you can have them hold your feet and take some of the weight off. I have seen in the gym a "dip machine" that can also be used for pull-ups that will take some of your weight off if you don't have a partner. You can also do pull downs working up to your body weight.
Unless you are doing crazy things in the gym you don't need to worry too much about getting huge and buff, women typically don't have enough testosterone for that to happen..
Last edited by 1depd; 10-11-08 at 09:15 AM.
But when a long train of abuses and usurpations, pursuing invariably the same object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new guards for their future security.
Translation for the intellectually challenged: If the government screws the people too much, it is the right and duty of the people to revolt and form a new government.