I'll not be held responsible for any injuries or suffering if anyone tries this techniques. It requires special guidance from a qualified instructor. I doubt you will find many instructors that know this technique as they are very old techniques and are only usually taught to special students with high potential, dedicated, respect teacher and self-respect, and patience.
To start with, lay on your back on the ground. Bend your forearms at your elbows with your fists closed. The punching surface of your fists must be facing upwards. Straighten your legs with your feet flat on the ground. Lift your body off the ground with our elbows. Now direct your energy to your elbows and continue to hold your body up with them. You must hold this position for 15 minutes then take a break. While you are suspending your body in the air you must breathe regularly to aid you in concentrating. Do this 10 times in the morning and 10 times at night. The second stage is to use just 1 elbow and 1 foot to suspend you. Try your right hand side then when you need to rest go back to both elbows and feet. Now try your left hand side. Do this 10 times on each side. Do this art for 1 year on earth then use smooth stone against your elbows and feet. Do this art for 2 more years then do the same on rough stone. Do this art for 1 year then dig a trench 3 feet in width and 6 feet in length and put small and large cobbled stones mixed with mud and sand into the trench. You must also put water into the trench to and let it harden a bit to form a cobbled board. Now practice the above inside the trench on the cobbles. You will feel pain so you will need to treat your elbows with medicine. Keep practicing until you feel comfortable with the exercise. Now add crushed stone, mud and sand to the trench with some water to harden it up a little. Do the same until your elbows and heels are hard. To achieve this skill it requires at least 3 years of practice.