I would agree! I'm 5'10" and played point guard (not a great athlete either

and was the third leading rebounder on our team. It's about reading the shot, knowing where to be on the court, and timing your jump when it comes to rebounding (in addition being able to do multiple things at once - having your head on a swivel). As for defense, again, agree for the most part. The words are "discipline" and "consistency" when it comes to defense. Effort is certainly part of it, but you have to be strong mentally and know where to be on the court at all times.