If you've ever played Frisbee with Grant, you'd know that he thinks he's Michael Jordan. Seriously. Instead of ever just taking a few steps back to catch the frisbee, he'll stay exactly where he is and try to jump and catch it. Since Grant is 68" tall, the letter "a" here represents approximately 36" (a little more half of his body). The letter "b" represents the approximate reach of Grant's arms outstreched. And the letter "c" represents the remaining 33" of pure vertical leap he'd require to catch the frisbee. Somebody get this kid a trampoline.