Good exercise programs or video workouts for weight gain and tone?

Anonymous
I'm already in good shape pretty good shape, but I want to get some tone and thicken up a little. I recently started doing P90X but I heard it isn't the best for weight gain, but I'm sure it will improve my overall health and quality of life. I can't afford a personal trainer and don't have to time nor the interest in counting calories or adhering to some special diet, but I eat a pretty balanced diet already.

So what are good workouts for weight gain, that I could do on the cheap? What about Crossfit? I don't know much about it but I was in the Marines, and a lot of the exercises seem similar.
Good exercise programs or video workouts for weight gain and tone?
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