The Maui dolphin is one of the rarest animals in the world and it is estimated there are only 55 remaining.
To raise awareness of the animals, the world wildlife fund enlisted the All Black's fitness trainer to put us to the sword in a special dolphin-themed training session.
It was 55 minutes of hard core exercises and drills which almost broke us; correction, it did break us.
And that was only the warm-up.
Watch the video for the full Story report.
If you would like to take part in Challenge 55 to save the last remaining 55 Maui dolphins click here.