To build extra muscle, you need to eat in excess of what you currently eat, and work out with weights on a regular basis. How much muscle you can gain, how quickly and with what definition is largely determined by your genetics and age. But everyone at almost any age should be able to gain some muscle and strength with weight training. Proper nutrition is a crucial element in the muscle building process.
Lastly we come to full-body workouts. The 5 x 5 program could also be considered a full-body workout program to a degree, since you work almost all the major muscle groups with the three exercises you choose. But, true full-body programs will provide one direct exercise for each muscle group - quads, hamstrings, chest, back and shoulders (arms are worked when doing chest and back).
If you want to improve your shoulder width, prioritize this workout, swapping it for your regular shoulder sessions every third deltoid workout. Or, depending on present development, do it every other workout as needed. Use the sequence of exercises prescribed here: Their purpose is for progressive prioritization, from heavy weight for strength and muscle-group size to higher reps for isolated muscle size and deltoid striations that draw the onlooker’s eye to those points located at the maximum width of the shoulder girdle.
The military press is similar to the shoulder press but is performed while standing with the feet together. (It is named "military" because of the similarity in appearance to the "at attention" position used in most militaries) Unlike the seated shoulder press, the military press involves the majority of the muscles of the core as stabilizers to keep the body rigid and upright, and is thus a more effective compound exercise.
Splits. A term used to describe how you organize your workout. For instance, you might decide to work only your chest on day one and your back on day two. This is the type of lifting you do once you get stronger and more experienced. This is not necessary or recommended for beginners because it's too intense. It's not only unnecessary but it could lead to injury or overtraining (burnout).
After a muscle has been stressed sufficiently with high-intensity training, you must not train that muscle again too soon so that you allow for the body to respond with a compensatory build up of new muscle tissue. You can measure your progress to determine whether or not you’re allowing enough recovery time for growth to take place simply by taking note whether or not you’re stronger any time you repeat any given workout. Some people have argued this point with me and have stated that there is no relationship between muscle size and strength. If this is the case, and you don’t need to get stronger in order to get bigger, than how exactly should you go about getting bigger? By getting weaker?
Using these will make your exercises harder, more stimulating, muscle fiber-wise, and more interesting. For example: Do three 12-rep sets of squats. Do the first 4 reps using a pause at the bottom, then do the next 4 reps using a five-second negative. Finish the set up with 4 "normal" reps. Or do three 10-rep sets of chin-up. Do the first 5 reps with a 3-second pause at the top and a 3-second eccentric. Do the second 5 reps explosively.
When lifting it is essential to focus your mind completely on the muscle group you are attempting to work on. This makes sure that you are actually using the target muscle to lift the weight rather than accessory muscles or even momentum. This skill will develop with time, and as you progress in making that mind to muscle connection, your workouts will become much more productive and efficient.