You must get insurance to cover yourself legally. The insurance every coach must get is:
1) Public liabilit
2) Professional indemnity insurance
3) If you have employees: If you have employees you MUST get workers comp insurance also.
There are two links here:
https://iict.com.au/insurance or www.bizcover.com.au
Note: It’s important to get insurance for up to $20M I have seen most of our students do.