Take an aerotow in a glider, that's a form of formation flying. You get to fly above and below the slipstream and out to the side (but the tug pilot will get p****d off if you try to overtake him). Normally you are climbing but it is sometimes necessary to descend on tow, without catching up with the tug, by use of airbrakes. You will be surprised how easy it is after a few abortive attempts. You will also be surprised how quickly it all goes pear-shaped on your first attempts before you have got the knack, especially if out of position to the side and you are trying to get back behind the tug.