Crowds are worse than Times Square on New Year's Eve
If battling your way through hordes at the gym is now officially part of your workout plan, and finding a spot in your favorite class feels a lot like The Hunger Games, your gym has probably oversold its membership.
There's an actual formula gyms use to determine how many members they can comfortably accommodate, but it's not uncommon for management to get greedy and keep signing people up. This strategy might work when airlines do it -- they can offer free tickets to passengers they have to bump to a later flight. When gyms do it? You just end up waiting an extra 30 minutes to take a turn on a treadmill. The gym is the only one that wins.
Trainers only have an "in-house" certification
Ah, the joys of a highly unregulated industry.
If trainers at your facility hold a "certification" provided by the facility itself, with no other fully vetted and accredited certifications to their names, be very cautious about listening to their advice. Anyone can throw up a dumbbell and call themselves a trainer, and any facility can put together their own class for employees to "certify" them. This doesn't mean the information they're providing is accurate or based on scientific research.