What you can train
Dumbbell presses, rows, and curls plus leg press, chest press, lat pulldown, and cable work cover the whole body. The Smith machine handles squats, RDLs, and split squats when you want loaded legs.
Yes; its dumbbells to 75lb, Smith machines, and full machine circuit cover enough to build real muscle for years.
Planet Fitness is plenty to build muscle. It has dumbbells often up to 75lb, Smith machines, cable stacks, and a full set of resistance machines, which cover every muscle group. The limits are no barbell squat rack and no heavy free barbell work, but you can hit chest, back, legs, shoulders, and arms hard. Muscle comes from progressive overload and effort, not from having a power rack.
Dumbbell presses, rows, and curls plus leg press, chest press, lat pulldown, and cable work cover the whole body. The Smith machine handles squats, RDLs, and split squats when you want loaded legs.
You lose the free barbell back squat, conventional deadlift, and heavy overhead press, and dumbbells cap around 75lb. For hypertrophy that cap rarely matters since higher reps still drive growth.
Muscle responds to 10 to 20 hard sets per muscle a week near failure with added load over time. Machines let you do exactly that, and beginners can add size for years there.
Yes; its dumbbells to 75lb, Smith machines, and full machine circuit cover enough to build real muscle for years.