ISSA Certification, also
I just got certified as a personal trainer with International Sports Sciences Association--more weight training oriented, but aerobics, too. always founded on good science. And yes, we took a closed book 3 hour exam, attended a 2 day seminar, viewed and demonstrated exercises--I started studying the material seriously in Nov 99; tested and achieved on July 30, 2000. You can take up to two years to test if you need to, however.