I've been in two different clinics - generally the PT doesn't stay with you the entire time. Especially if that time is something like 10 minutes on a bike. They did stick with me on the various small exercises, such as flex and extend your foot 15 times, and all new exercises were supervised. A PT isn't your personal trainer, do you really need someone to sit with you for 10 minutes on a bike?

When you're doing specific exercises, and I've had lots of them for my knee, in one clinic the PT would get me started, then go on to the next client; I'd finish and he'd have me start something else. In the second clinic, the PT stayed with me for exercises and some wound area massage for 1/2 hour, then I was turned over to an aid to complete my work-out therapy. The first clinic was a bit more like a 3-ring circus, with banter between the clients/patients in the main gym. The PT was amazing that he kept up with all of us - but he also limited number of patients per hour. The second clinic had more therapists, and it was one-on-one until the end when I was turned over to an aid to complete my exercises and then they usually juggled a couple of us at a time. Once I completed one exercise, I generally knew what was next and would continue on without waiting for the aid.

Sometimes people are quiet because they're concentrating. What looks like an easy exercise for you isn't so easy if that's the body part that's being worked on.