Standing Posture
How does he do it? This iconic shot of Jimmy Page doesn't tell us how he plays like he does, but it does tell us a few other things. Imagine yourself grabbing that Les Paul, slinging it down near your knees somewhere and rocking back like this. Now take it off and see if you can still sway as far. Of course you can't, it's obvious that the weight at the front is balancing the weight at the back.
Ask yourself as you strap your guitar on: