http://freeflightadvice.com/advanced-skills-ppf/

First step, get loose! Your whole body should be relaxed, and
letting the harness support you. Obviously you use these muscles to weight shift
(as well as your core, as we’ll talk about later), but when not weight shifting
you should be as loose as possible. Loose hands are essential- it’s HANG
gliding, not HOLD ON gliding. If you’re death gripping the base tube, you are
throwing out valuable information about your wing and the air you are in. In
fact, contact with the glider should be as light as practical. I strongly prefer
to fly with open palms, and just my fingertips on the top of the base tube.
Finger tips are very sensitive, and the light contact allows you to really feel
out the wing and air. Flying that loose takes practice, but working on it pays
huge dividends in the quality and precision of your flying.

Once you’re loose and sensitive to your wing, it’s time to focus on
“conservation of motion”. What that means is not making unnecessary inputs, or
over doing the inputs that are necessary. True conservation of motion is only
possible once you are really feeling the wing, so it’s important to go in order.
Some turbulence is just turbulence, while other turbulence can turn the wing or
require pitch input… and being loose and sensitive helps decipher if any input
is needed. When an input IS needed, try to shift your weight slowly and
smoothly.

Do not, under any circumstances, push down on the top of the base tube! Because
the control frame is raked forward, the base tube is forward of your hang-point…
which means any weight transmitted onto the basetube is a nose-down pitch input,
whether you know it or want it.