Yes, you can use the same email address for multiple athletes

The OnBeat system requires that one email address be used for each person.

If you want to use one email for multiple people, you will need to use your Gmail account or create a new one.

Gmail allows you to add a plus sign to an email address and Gmail ignores anything after the plus.

For example, let's say your email is test@gmail.com. By adding a plus sign, you can create accounts for:

Sending an email to any of these would direct the email to test@gmail.com.

This approach could be used for children who don't have email addresses, or if you have a facility that does not want to have people enter their own email addresses.

https://gmail.googleblog.com/2008/03/2-hidden-ways-to-get-more-from-your.html

Have another question about this?