I am in my 3rd week of p90x, my schedule is as follows:

day 1 - chest + back

day 2 - abs

day 3 - rest

day 4 - chest + shoulder + abs

day 5 - biceps + back

day 6 - abs

day 7 - legs + back

Any changes needed to it? I am trying to GAIN weight, not lose. My cardio is good, i do not need to work on it. I only care about gaining muscle mass/definition.

The thing is, do i have to use the rest week? Can i just continue with this schedule for the full 90 days? Should i change it? Input please and thank you :)

the triceps come into play during the chest + shoulders workout.