I'm 18 5' 8" and I've been working out for about 8 months now, and I seem to hit a plateau. I started at the end of last year, but didn't really have the time to commit to it. This summer I had a lot more time and I started working out five to six days a week. I keep my workouts pretty short, an hour to an hour and a half, and I rotate between Arms & Shoulders, Chest and Back, and Legs. I do Abs everyother workout, independant of that cycle. I have about four exercises from which I choose two for each workout, in an effort to keep a variety of exercises going.
I do 3-5 sets of 6 reps. So 6 reps for as many sets as I can, and when I can't do that any more, I stop. When I reach 5 sets, I increase the weight next time.
Because I'm focusing on weight gain, I have done barely any cardiovascular except for my five minute warmups before listing.
In the first month of the summer I gained about five pounds, but since then my gains have slowed down dramatically, I gained only about a pound last month. I'm also increasing weights much more slowly than before. I sometimes not even increasing at all between workouts.
I've been trying to eat a lot, I have a shake with fruti, protien powder and soy milk after every workout. I try to eat as much as I can at other meals, but sometimes I feel nauseated and I can't eat any more (especially at breakfast).
I'm really frustated that I have stopped making gains. What can I do to start improving again?