That depends on each person. 99% of our new clients do just fine attending a Pilates Core class. With less than 20 clients per class for mat and 10 for reformer classes, our awesome trainers can easily modify exercises to suit various abilities. Although still quite intense, classes are broken down using simple exercises so all individuals get the most out of their workout. If you have chronic back pain, are coming back from an injury or are pregnant, a one-on-one session would be best to assess your situation.