The following is taken from Get Paid University.

Once you’ve answered these questions, see what theme or key points pop out at you and start writing your bio. Remember to include items that will help people form a connection with you. For example, if you’re a mother, mention it. Or, if you’ve been married and divorced and made it through the process, include that. Make sure that your bio is not just a list of accomplish- ments but that it shows who you are as a person.

You can also draw a tie between your prior work and coach- ing in your bio. If your background and training are a close fit with coaching, mention how it was a natural progression. If they’re completely at odds with coaching (is there such a field?), you can mention why you’ve made the switch.