Quoting Nomad

Awhile ago, I lost about forty pounds through various means, mainly adjusting my diet and exercise. My workouts have since intensified in the summer, and especially since August where I've been able to actually go to a gym (There's only so much you can do with 10 and 20 pound free-weights at home). Ideally, I would like to weigh about 150-155. However, I am unable to achieve any healthy weight gain and wondered if anyone had any ideas.

Here is kind of a snap shot of what I do:
Five day split
Monday - Abs
Tuesday - Chest
Wednesday - Legs
Thursday - Biceps
Friday - Cardio and whatever I may have missed/needs to be worked out more

I eat three meals a day, although I think ideally I'd like to eat five, focused on protein with minimal fatty/fried foods (Which is difficult here because it's all that is served). Being at college really cockblocks your food intake when there are only specific times I may go. When I first came to college, I weighed 137 and now I weight around 140-142 depending on the day with a body fat of about 8%, but I simply can't gain anymore. Strangely, I've noticed large changes in strength. I could previously run a ten minute mile, now I can run a seven, my bench press was non-existent, now it's around 130, my squat is 370, my deadlift around 140, and curls are around 100.

I'm wondering if I am doing anything wrong, do I need to give it more time, or am I just not the type that's able to build muscle?

Some of your stats are impressive, so you must be doing something right, that or how you arrived at some of your numbers is off somehow. A 140lb guy squating with 370lbs on his shoulders is quite impressive.

Your split has me wondering if you're omitting your back, triceps, and shoulders from your workouts. A lot of exercises will work multiple groups but its good to shoot for two exercises per group at a minimum to ensure you train all your opposing muscle groups. For example, if you work your chest out and never do anything with your back, it will eventually lead to posture problems as your chest tightens up and starts pulling your shoulders forward.

I'm not sure how tall you are but you remind me of a buddy I've had since high school. Hes what everybody calls a "hard gainer." Tall and skinny. The kid never gets fat no matter what he eats, but because of the way his body is configured its hard for him to add a lot of size.

I'm gonna simplify this a bit because I have to get ready for work but in a nutshell you won't be able to add muscle without two things: a surplus of calories in your diet, both carbs and more importantly protein, and the second is you aren't going to to it without picking up some bodyfat along the way though from the sound of it this is going to be less of a problem for you.

You need to keep your protein intake high, 1g of protein per every pound of bodyweight you have at a MINIMUM. 1.5-2g per pound is even better and don't be afraid to throw a boatload of good complex carbohydrates at your body with each meal. 5-6 meals a day is optimum but its not possible for everybody. I work a ten hour shift in a busy district so 5-6 meals a day isn't going to happen for me when I'm working. I still make sure I hit those minimums though by adjusting the caloric and macronutrient content of the meals that I do manage to have.

So, long story short...keep working out...eat more...eat better...and buy a GNC gold card! Start taking some creatine. **Edit to add, if you think its hard getting to the gym in college wait till you get finished and you have a job.