PADI (Professional Association of Diving Instructors) is a recreational diving membership and diver training organization founded in 1966.
There are following PADI freediving certification levels:
| Freediver | Advanced Freediver | Master Freediver | |
| Prerequisit (age) | 15 years | 15 years | 18 years |
| Prerequisit (swim) | yes | Yes | yes |
| Prerequisit (course) | Freediver | Advanced Freediver | |
| Prerequisit (others) | First Aid + CPR | First Aid + CPR | |
| Requirement (STA) | 1:30 min | 2:30 min | 3:30 min |
| Requirement (DYN) | 25 m | 50 m | 70 m |
| Requirement (CWT) | 10 m | 20 m | 27 m |
| Theoretical exam | yes | yes | yes |
Next to the PADI freediving certification levels there are also other freediving certifications available from AIDA, SSI or CMAS.
Sources:
https://www.padi.com/courses/freediver (Retrieved 03.04.2019)
https://www.padi.com/courses/advanced-freediver (Retrieved 03.04.2019)
https://www.padi.com/courses/master-freediver (Retrieved 03.04.2019)