I think that's a pretty common misconception.
As I've said on these boards before, I am 31, fml and usually weigh around 45 kgs.
I used to train up to 12hrs a day for years, and hopefully heading back toward that soonish. Atthat weight I used to be able do good formed sets of up to an 8rep pyramid set or so of pushups with someone on my back weighing anywhere from 70+ to 100+kgs.
I also carried 90+ kgs of luggage around china ( and if you see their train platforms in the counrty that with India has the worlds biggest population :0 :0:0) you'll understand the site that was.
I think at the end of the day, for real strength, as kgs you can lift per pound of body weight for extended periods and reps ( as opposed to one massive lift alah arnie muscles), it comes down to less carbts and more protein to pack your muscles dense , a good glyco fuel to inject your carbs deep into the muscle fibre and for me, a continued effort.
If you do both, lift big aaand do higher rep lower weight workouts, on a higher carb intake plan, you can effectively build size and strength for anywhere upto 10 weeks. If this is your goal, resting between 10 weeks lots to up cardio and enduro etc, then cycle it in .
cheers
Blooming Lotus