The best workout plan for a skinny guy would be one that focuses on the whole body. The workout plan will need to consists of exercises that focus on the lower body, core and upper body.
A skinny guy most likely has an ectomorph body type. Ectomorphs struggle to gain weight and have a quick metabolism. In order to effectively build muscle, food is very important. Starchy foods, protein and high-calorie foods are essential in the diet. A good rule to follow is that the individual needs to eat 0.6 to 1 gram of protein for every pound that he weighs. A skinny guy needs to eat the appropriate amount of calories in order to build muscle.
Keeping a food log is a good way to make sure that the appropriate amounts of foods and calories are being consumed. It is important to do the right exercises correctly. If the individual can not see a change in their physique within a few weeks of beginning the workout regimen, there is a chance that workouts are not being done properly. Another tip to keep in mind is that muscle can be built with less exercise, as long as heavy weights are incorporated and the workout focuses on as many of the muscle groups as possible.