Unfortunately, there is not an exact science to hook placement. It depends a lot on individuals. Generally hooks are placed into regions of the body where the skin is soft and stretches easily. There are some fairly common placement points and normal "sweet" spots on most people. Some of the placements are chest, upper to middle back, hips, calves, knees and forearms. Of these most have sweet spots, although the chest and many points in the legs can still be very uncomfortable.In addition, hook placement should be varied slightly taking into account any suspensions done recently to minimize damage. Other small variations occur due to skin irritations, fresh tattoos, and body piercings.