If you are real close to the basket when the shot goes up, you must “box out” and create some space to rebound. To “box out” from your defensive position: Go towards your man and make contact. Pivot so you “Put your butt to their gut” and just slide with them, keeping them away from the rebound. When boxing out, keep your man from pushing you in towards the basket, so you can maintain good rebounding position. (If you let them push you under the basket, the rebound will go over your head). Then go get the rebound!