That’s because Planet Fitness isn’t designed for those wanting to bulk up or work on heavy lifting. As a bench press involves a weight bench and barbell or dumbbell (via VeryWell Fit), it doesn’t exactly fit in with the gym’s brand. Sure, there are ways to focus on the muscle groups targeted by the bench press (chest, triceps, and shoulders), but you won’t find anything close to what a bench press can provide in Planet Fitness.
But as the gym is focused on providing a service to beginners and novices, it does take a lot of skill and training to get to the point where you can use a bench press without injuring yourself. That’s not to say beginners can’t use a bench press — it just takes time to get used to the process of warming up, getting used to the feel of the bar, and learning good form while exercising as VeryWell Fit notes.
And as Noob Gains writes, with beginner and novice gym-goers there’s more of a risk for injury by dropping the bar on their chest or not having a spotter present when lifting heavier weights.