Who else has noticed that an asparagus spear may be as tender as can be at the tip but is as tough and woody as can be at the other end? That's why recipes here always-always suggest "snapping" off those woody ends before roasting, slow roasting, steaming, microwaving, whatever your favorite cooking method.
But where does the edible, tender part of the asparagus spear begin and the woody part end? It depends, spear by spear but there's a natural breaking point. Here's how to find it. Just remember the rhythm! Bend, bend, snap! Bend, bend, snap!