Only 2 Mins! Get prominent, sexy, defined collarbones (Blackpink collarbone) exercise & massage Only 2 Mins!! How to get prominent, sexy, defined collarbones | Exercices & Massage. The collarbone or clavicle is the longest horizontal bone in your body. You have two - one on the left and one on the right connecting your shoulder blade and your breastbone. The collarbone will make you look physically prominent and beautiful. If you don't have naturally visible collarbones. Start by losing weight o