Anyone that wants to can build up their body, even if they are skinny; you just have to know the right way to go about it. Unfortunately buying the drugs which supposedly give you a great body in just days, do not work and so the only ways to build up your body and have it stay that way is to do an exercise regime and possibly change your diet. There are websites like http://skinnyyoked.com/bodybuilding-supplements/ that can guide you in what you need to do if you are serious about building up your body.
There is no miracle drug that will beef up your body in days, not yet at least, and so you will have to work at it for weeks and possibly even months but those people that have already done it, usually find that the effort is worth it as the results they get are long lasting, even with reduced exercise and a less stringent diet.
As well as exercising, you will probably have to change your eating habits to ensure that you have enough energy for the increase in exercise and eat food that will help to build your body but not with fat. Many people opt to take dietary supplements in order to meet the required intake they need and there is nothing wrong with that provided you select the supplements you take care. There are many different so-called supplements available today but all too many hard works at all but some really do work well and so you should go online and look at some reviews to determine which are which.
The exercise regime which will be recommended for you will depend on the current size of your body and how much you want to build it up but any exercise regime recommended should be accompanied by exercises which are known to build up the strength of your body core. The usual exercises associated with building the strength of the body core are weighted squats and so they should be alternated with any exercise regime you are recommended for your size and shape.
Some people have found that when they do weighted squats, they have problems with their knees but these are people that probably do not start with un-weighted squats to prepare their knees for the weighted squats. Neither do these people probably go low with their squats. Although some people may think that the lower you go the more stress you place on the knees but they are wrong. If you squat low enough that your hips are at a lower level than your knees, the stress is taken from the knees and transferred to the hamstrings.