Sure, not doubt I would like that too.

But by definition a "Personal" trainer would prepare a fitness plan specifically for you and for that reason I understand I could pay 100 CHF/hour to a trainer.

But 3 each 90 CHF ?, that is CHF 270 per hour and seems quite high and at the end the training hour would not be that "Personal"

In tennis for example, you can get one hour private lesson for CHF 100.- ( swiss prices ) or CHF 50 for a non-swiss-certified instructor.

Once I shared a private lesson with a friend, she needed much more attention than me, so at the end I spent most of the hour watching and waiting ...