I highly disagree with you. Doing only 5 rep sets isn't sufficient enough to add slabs of muscle. Time under tension is what builds muscle mass. Someone who does heavy weight with low reps will have smaller dense muscle. Where as someone who does bb movements with higher rep ranges will have bigger muscle but lack the strength. So the obvious solution is to train both ways to get the best of both worlds. 5x5 is a basic template for beginner to intermediate lifters wanting a general base of size and strength. It lacks the substance to apply to advanced lifters of any discipline IMO. Regardless if your natural or enhanced, beginners can follow any one of the tons of programs out there and progress. So try a different one out every 3 months and eventually you'll find a good one.
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That's right you need bb routines to add slabs of muscles but for how many people these routines works? You can add slabs of muscles using bb routines only if you are a genetic freak or you rely on steroids, there is no other way. Most of the hard gainers quit lifting weights because they fail to get the results.
Example: There is a personal trainer in my gym who trains people with his bb techniques and believe me he's killing them with the load n higher reps but no results in about 3 months not in strength nor in muscle size. Reason; because they are hard gainers and he's trying to do something which never happened in this world before.
Is it possible to get stronger and stay skinny? Yes power lifters looks different because they don't rely on isolation exercises. You can't look same as those BB guys but still you will look better than average lifters and obviously you need a proper diet plan.
Combining the "both worlds" is not really something to try at home. I mean seriously this method is for very advanced lifters who know exactly what they are doing.
Trying the online or magazine bb routines is the reason why most of the people fail to gain muscles. Because if you are not using those supplement which came with that routine it's not gonna work in 12 weeks unless you are a genetic freak. People who design these programs actually know what you need when you are following their workout plan, and you need those supplements to gain some muscle size and little strength. I call it BS except linear periodic BB routines. The reason it works is simply you don't stick to 8 to 12 reps and you also lift heavier weights that you can't handle properly for more than 5 reps. Instead of combining both worlds follow a intelligently designed "classic periodization".
You said "beginners can follow any one of the tons of programs out there and progress." I totally agree with you, a beginner should start lifting with any program except body part splits, it's a waste of time and effort for beginners.
Once again hypertrophy is not about reps. hypertrophy is mainly centered around relatively high levels of tension (load on the bar relative to your capacity) and volume of work. 5 sets of 5 reps enable both and strike a good balance (not golden, not directly from God, not the only rep and volume range you'll ever need, not magic - just a good general balance for highly productive core lifts).