Heavy Lifting Question

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I see alot of people posting about doing Heavy Lifting and how it has really helped them. Here is my stupid question:

What is Heavy Lifting exactly?

What do you do?
How do you do it?
Various exercises?
Any other good info you would like to share.

Currently I do mostly aerobic activity but have recently started what I guess could be called strength training primarily using my own body as resistance.

Thanks in advance for the info.

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