Anyone who has been to a stadium before has seen many bleachers; that is, long rows of benches where spectators may sit down. Bleachers are essential for any indoor or outdoor area where many people will see a live event, ranging from sports to a music concert to religious services at a church, synagogue, etc. When it comes to indoor bleachers, these bleachers may be retractable, just like retractable stages, and outdoor bleachers might be fixed in place. Bleachers may vary somewhat in their material and whether they can retract, depending on need, and some bleachers can be quite comfortable …