Cardio isn't going to inhibit muscle gains but it will certainly slow them down if your son doesn't have his diet dialed in. In order to gain muscle you will have to have a caloric surplus available. Meaning, he will have to consume enough food to meet his biological needs, that is, his BMR, then he will need to eat enough to accomidate the workout and cardio and then something left over for muscle building, roughly 500 calories of surplus is recommended.
The question is, is he doing cardio to lose bodyfat or for endurance?
I ask because in order to lose bodyfat, you're now talking about creating a caloric deficit which is contrary to building muscle. Obviously, it's not the most efficient approach to try to do both so depending on his goals, it's often best to choose to do one or the other.
As for planning or building a training routine, there are sticky threads posted in the Training forum that have many excellent resources to help as well as some great threads by one of our Mods, CowPimp regarding building training routines.
Hope this helps.
BTW, yes, it appears to me that he's probably training too often and inefficiently. For example, dedicating an entire day to biceps and another to triceps. Again, more info can be found in the sticky threads.




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