Skill I totally see where you're coming from. It depends if he's willing to do the research.
If we were training together that's the periodised program I'd follow.
Conditioning 1 will : increase capillary density, cardiopulminary output, neurological engagement, connective tissue strength.
Strength will build on this because : increase neuro engagement means ability to lift more weight. Increase capillary function means more atp, oxygen and glycogen delivered fast enough with the rapid fatigue of strength training. And CV will enable better replemenishment of energy lost.
Hypertrophy will build on
this by : Making used of increased strength gains to achieve heavier lifts and therefore greater microtrauma. Sustained delivery of atp, glycogen oxygen will be utilised for prolonged time under tension (longer sets) and recovery. It will also allow faster recovery, repear and growth due to efficient macro/micronutrient delivery post workout and greater resistane/clearance to lactic acid.
Conditioning 2 will : Make use of all of the above to achieve much more aggressive training, with heavier weights for longer periods. This will result in much, much greater fat loss and maintenance of mass. and make Strength in the next phase far, far more effective because he'll have all of the benefits of the previous conditioning phase plus a MEGA strong posterior chain.
I know I've rabitted and it's mega long so sorry. OP doesn't need to know this pap, it's just if he follows something along those lines, he'll get better gains much faster. Everyone here who's been training for a while is periodising, they probably just don't know it.
As a side note, I don't condone 5 x 5 for beginners. Their posterior chain, conditioning and lack of connective tissue strength makes it less effective, and more dangerous.
My tuppence, sorry for long thread, it's why i only lurk in SA these days
Ant
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