Most clients are MILFs with $$$$$ who need more attention that a newborn baby.
Some are hot, most are not
Very rarely do men want a trainer, if they do, it is only for a short time. MILFs will stay forever, until you kick them to the curb and lock them out of the gym
Young girls come and go, they are so horny they can't hide it. You act like you don't see it, but everyone else in the gym does.
Trainers should be real familiar with what the ceiling in their gym looks like
Some female clients stink so bad you dread seeing them pull up, you are hoping they will miss their appointment so you can run to your car and GTFO of there. You won't even charge them for missing... hell, you may even pay another trainer to take them from you (if possible)
Dont ever, ever, ever, have sex with your clients.
Ever.
They can promise there will be "no strings attatched"
They can promise they dont have a BF or husband
They can promise they won't stalk you afterwards
They lie.
Personal training can be a lucrative business if you have a reputation for being able to get your clients in shape. Other than that, I can't think of anything else about it that I like.
You sure as hell don't feel like working out after training other people all day.