I agree on with you that everyone is different, but other than someone being assisted or a genetic freak (in a good way) I don't see how one could train with the utmost intensity twice daily. Right now my current routine is as follows:
Mon/Wed/Sat alternating between A and B with the goal of adding 5 lbs to each lift per workout until linear progression fails.
A)
Squat 3x5
Bench- 3x5
Weighted Pullups/Chinups -3x5
B)
Squat- 3x5
Overhead Press- 3x5
Deadlift- 1x5 or Powerclean- 3x5
I can't see how I could possibly train with that kind of intensity more than 3x a week, let alone twice daily! Though like we already said the best thing he can do is educate himself and do what is best for him.
Props for the squats. Right there, that is legit. See, this is what the rest of the thread needs to pay attention to. You're right that those are super high intensity movements, but the trick is actually and literally getting 110% of your energy into each one... which is much harder than it seems. And for someone just starting out, especially with a smaller frame, they would actually benefit from splitting those up into two or even three sessions. For example:
A)
Morning: Squat 3x5
Afternoon: Bench- 3x5
Evening: Weighted Pullups/Chinups -3x5
B)
Morning: Squat- 3x5, Deadlift- 1x5 or Powerclean- 3x5
Evening: Overhead Press- 3x5
In the A group, since each is relatively independent of each other, spreading them out like that would allow the introductory body to adjust energy levels to recooperate more effectively to HANDLE that amount of intensity for each session. After they've practically puked their guts out
from the squats, most likely the beginning body will NOT be able to give maximum effort for the critical bench press immediately after, and furthermore for the pullups. This way, the body can have adequate rest to give it literally 110% for EACH movement.
In the B group, since squats, dead and clean are related they obviously should NOT split them up into different sessions because then they would be in the wrong stage of recovery to tear them up again in the same day (since they're doing low-reps/high intensity... if it was opposite, high reps/low intensity, it wouldn't be as critical.) Further, since that morning session is pretty powerful and combined, the body would benefit from the extra energy gain from not having an afternoon workout and finishing up hard with the overhead press in the evening.
That's what I've learned would be the most efficient way to utilize the body's energy and recooperative powers. It's a natural way to combat "over-training" and also teaches the body to be ready "on edge" and "on peak" no matter the time of day (which is going into another theoretical area of actual combat training) instead of teaching the body that it can relax and deflate at whatever time you don't train. The added plus of this type of regimine is that you keep a pump throughout the day and you're always lookin' prime! Hehe...
However, the problem obviously lies in the fact that hardly no one (besides professional bodybuilders) has the actual time to get in that many sessions a day due to work, family, etc. But if you could do it, that would be optimum. Same philosophy applies to eating. And same applies in microcosm between individual sets.