I'm going to start on Crossfit tomorrow. I'm planning to do it 3 times a week, at least the first month, and after that I'll increase to 5/6 times a week. I always wanted to be bulky and have a nice body. When younger, I was pretty slim and underweight. I started working out at college and so far I increased my weight in 20 lbs. Still, I'm so un-disciplined that I fear it will not work for me; the longest I've been going regularly to the gym is 6 months. Any advices? Thanks!