This morning at 8:45am I'm going to do a high-intensity, full-body workout following the "one set to failure" principle.
My 12 year old son Benjamin is going to join me.
He and I have been doing strongman and high intensity workouts together every week since the start of August.
Benjamin is a few years younger than me when I started serious barbell training.
My uncle was my trainer. He was an old school bodybuilder and former Kung-Fu ass-kicker.
He taught me how to use the good-old 5x5 system for gaining strength and size... and it worked.
5x5 is based on good principles. It is a great way to learn the proper form for lifting because of the high frequency.
I still recommend it for newbies and advanced lifters who need to brush up on lifting form, get accustomed to heavy weights, or are just coming back after time-off.
5x5 also worked for me because I have pretty good genetics for lifting.