An example of the barbell technique is someone who works a really stable day job and does something relatively risky in the evenings, like making YouTube videos or investing in stocks.
These are exercises and activities performed inside, often using equipment such as bars and ropes, intended to increase the body's strength and the ability to move and bend easily.
That's where you put... make sure you have a squat rack, and you put the bar behind your head on your shoulders and you just squat as if you are sitting on a bench and come back up.
But by placing a reasonable amount of weight on a barbell and doing a reasonable amount of reps, he protects himself from the irreversible harm of failure that might come from lifting a weight that is too heavy.