It's a flurry of action for a fitness fanatic on a warship patrolling the Arabian Gulf.
Leading Seaman (LS) Physical Training Instructor Callan McDonald is passionate about promoting health and fitness for the crew aboard HMAS Melbourne.
His main goal on his first deployment as a physical training instructor is to ensure the ship's sailors deployed on Operation Manitou are fit for their sea duties and able to respond to any incident.
Operation Manitou is Australia's contribution to the Combined Maritime Forces (CMF) in the Middle East Region.
The CMF undertakes patrols in the Indian Ocean and Arabian Gulf to intercept the trafficking of drugs that help fund international terrorism.
Originally from Hobart, LS McDonald began his naval career in 2003 and said he spent his first seven years in Navy as a boatswain's mate.
"When I decided to be a physical training instructor in 2011 I needed to totally reorganise my life and made fitness my priority," he said.
"The best part of being a physical trainer on Melbourne is being able to help people with their fitness goals.
"I enjoy watching the crew achieve those goals, transform their bodies and change their lifestyle for the better.
"I try to keep them motivated and focused on their training while working together as a team."
LS McDonald said he had other duties on Melbourne which included keeping watch on the bridge as a quartermaster and being in charge of the forward repair team.
"My other responsibilities include looking after the ship's café and maintaining the gym equipment," he said.
"One of my favourite activities is organising sporting events in foreign ports against local teams.
"I also facilitate adventure training activities or day tours for the ship's different departments.
In his latest fitness project LS McDonald has organised a competition called the 'Biggest Shredder' for Melbourne crew members who want to lose weight.
LS McDonald said close to 25 sailors entered the event and the initial weigh-in was on September 16.
"There will be prizes supplied by the welfare committee for the male and female sailors who lose the most weight by individual percentage," he said.
"The contestants are required to attend at least two training sessions with me each week and submit a log of their training and diet.
"My goal is to motivate people to be fit and confident with their bodies and their friends and families will be able to see the results of their hard work by the end of the tour."
LS McDonald said he was proud to be deployed and be on a team targeting the illegal drug trade,however he thoughts are never far from home.
"I am missing my wife Rachael," he said.
"We recently celebrated our second wedding anniversary.
"We communicate with Skype, telephone and Wi-Fi whenever we can, but I am looking forward to returning home next year."