Weight Warm Up

The actual warm up does not tax your nervous system or testosterone to cortisol ratio. Only once true maximal lifting takes place does a workout really happen to tax the before mentioned.
It truly does take this long to warm up to get a maximal effor to take place. An Olympic sprinter or lifter will not warm up for 10 minutes and then rip off a world record performance. Warming up the muscles and nervous system takes time.
Try maxing then waiting 5-10 minutes and go again. You will see how you warm up.

for 47 years .. have trained with a lot of the 'greats' .. I agree that a warm-up is necessary .. but the length of time you suggest, i.e. to go for a maximum .. 20 mins warm-up..is way to long ... if you train correctly... NOBODY can work out for more than 1 hour .. maybe even 45 mins .. after this time, if you are still training .. you have not put in enough effort... but interesting to hear your method.

it doesnt help you at all i mean you go you do your streches warm up with some lights weights and star pumping some iron