Is it really necessary to calculate the exact amount of calories/protein/carbs/fat I'm eating or can I just eat a good amount each day? I'm a skinny guy weighing at about 140 lbs with 16% or so body fat. I just want to bulk up a bit I don't want to be a pro bodybuilder. If I start eating correctly with a good combination of all the food groups and work out every other day should I expect some good results or is it important to track everything precisely? I'm on my feet for 5 days/week for 8 hours a day. I'm constantly moving and lifting 60 to 90 lbs throughout the day. That takes care of cardio. Would dumbbell exercises be enough to gain a decent amount of muscle?