Pilates is an exercise- relaxation techniques program so maybe you don't need to go completely into detail about your whole life but focus on those areas that the class is about. for example

My name is Jane Doe. I was born in 1970. My first experience with an exercise program was when I entered kindergarten and we had to go to gym class. I really liked throwing the ball in dodgeball. Then when I was in high school we had to jog around the nearest 6 blocks surrounding the school. Becfore we would all head out the door for our morning jog we had to all sit down on the gym floor and stretch various muscle groups. I took Chorus in highschool so we were taught how to breath correctly to maximize our singing.After high School I kept up with the stretching, jogging and the breathing activities. usually each separate. Now being in this class I can review and practice using all the components - the breathing and stretching ... together to better help myself. As for life outside of Pilates I like to read, write, listen to music. I am a mother of 5 kids and a wife who is managing a household and family on a shoe string of a budget.

Theres a biography that not only discusses how the person in the sample came into the class activities but also tells a little bit about themselves so that others in the class can get a feel for the type of person that person is.

The good thing about biographys is that they can be as detailed or as short on details as the person wants them to be. Since its about the person there is no right or wrong way or what to include in it as long as it includes something of history about what the class is studying where the boigraphy is asked to be done in. So put in what you are comfortable with and leave out what you are not comfortable with.

Hang in there.