The Juventus superstar, 33, shows no signs of slowing down as he continues his goal-scoring exploits.
The powerfully-built 6ft 2in forward remains one of the most physically dominant players in the world – still lightning quick, one of the strongest around and able to leap to incredible heights.
Earlier this year, Ronaldo said: "Right now I have a biological age of 23.
"I've still got a long time left, I can keep playing until I'm 41.
"I'm feeling good, happy, I can't complain."
But how does he do it?
Ronaldo does not have some super-secret formula and his incredible body is built on just a few key themes.
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Dedication to the gym is obviously key, but Ronaldo follows a Pilates-based routine that focuses on resistance work to strengthen his core.
Rest is also a massive part of his routine, as is his strict diet.
Post-match exercise has also become a huge part of his regime.
While other players like to sit at home in front of the TV after a match, Ronaldo heads straight to the pool.
He swims lengths, often alongside Cristiano Jr, which not only helps him unwind from the physical toll of a match, but also helps him build his huge physique.
Swimming is a brilliant full-body workout, exercising all of his arms, core and leg muscles.
Alongside his gym, Ronaldo has a secret weapon for muscle regeneration – a Cryotherapy chamber.
The £50,000 walk-in piece of kit works miracles on the body, with Ronaldo having one installed in 2013 after hearing it had worked well for Bayern Munich winger Franck Ribery.
Standing in the chamber for around three minutes, liquid nitrogen freezes Ronaldo to between minus 160 and minus 200 degrees Celsius.
Cryotherapy beats muscle soreness and reduces swelling, inflammation or sprains – allowing Ronaldo to be ready for the next match or training session sooner.
RONALDO'S FITNESS SECRETS
Hard work: Motivation to be the best is key – which Ronaldo's five Ballons d'Or prove
The world is your gym: Don't limit yourself to exercising in one place. Complete your routine at home in the morning or at night
Booze ban: No more wild nights out if you want to stay so sculpted
You are what you eat: Balanced diet with plenty of protein to fuel your workouts is best. Sugary foods are worst
Ronnie says relax: Downtime at home with family and friends is a must
Sleep well: Try and get at least eight hours a night, sleep is key for muscle regeneration
Ronaldo will also have hot and cold baths to stimulate muscle regeneration, while jets massage his muscles as he sits in the bath.
Rest and regeneration have become as important to Ronaldo as working out.
Ronaldo was once moved to deny he did 3,000 sit-ups in a day – claiming he barely did 1,000 "in one week".
That much work would only serve to injure and exhaust his muscles.
Sleep and relaxation is another key part of his routine, with the Portuguese sticking to at least eight hours of kip a night.
Family time, whether enjoying life with his children and Georgina Rodriguez or his mother, brother and sisters, is huge to the forward.
He explained: "Mental strength is just as important as physical strength.
"Training and physical sessions are most important, but living a relaxed lifestyle helps you to be the best you can be, physically and mentally.
"I spend my free time with family and friends, which keeps me relaxed and in a positive mindset.
"Proper sleep is really important for getting the most out of training.
"I go to bed early and get up early, especially before matches. Sleep helps muscles recover which is really important."
Explosive muscle work is part of his routine, but the real secret to his amazing body is Pilates and home workouts.
He said: "Fit in exercise wherever you can.
"You can do an abs workout in your bedroom when you wake up in the morning or before you go to bed.
"If you get into a routine then it makes it easier as it will become a habit."
Ronaldo was a famously skinny teenager who has completely transformed his body over the course of his professional career.
The change came when he heard comments from coaches when he was only 11.
"I remember the first time I heard one of the kids say to another kid, 'Did you see what he did? This guy is a beast'," said Ronaldo.
"I started hearing it all the time.
"Even from the coaches. But then somebody would always say, 'Yeah but it’s a shame he’s so small.'
"It’s true, I was skinny. I had no muscle. So I made a decision at 11.
I knew I had a lot of talent, but I decided that I was going to work harder than everybody.
"I started sneaking out of the dormitory at night to go work out. I got bigger and faster.
"I would walk onto the field, and the people who used to whisper, 'Yeah, but he’s so skinny,' now they would be looking at me like it was the end of the world."
Ronaldo's work would be wasted if he didn't follow the right diet.
The Portuguese is not a vegetarian or plant-based, but does limit his meat intake because of the higher fat intake.
Fish is a key part of his diet with Lisbon speciality Bacalao a la Brasa – a mixture of braised cod, onions, thinly sliced potatoes and scrambled eggs – one of his faves.
Ronaldo has said: "I eat a high protein diet, with lots of wholegrain carbs, fruit and vegetables, and avoid sugary food.
"Eat regularly. If you train regularly it’s important to keep energy levels high to fuel your body for better performance.
I sometimes eat up to six smaller meals a day to make sure I have enough energy to perform each session at top level."
Portuguese national team chef Luis Lavrador revealed: "Ronaldo eats all sorts of dishes, as the responsible athlete he is, but the one he likes the most is fish like gilt-head bream, swordfish and sea bass."
His Instagram account offers more clues with lean meats and green salad often seen, while heavy carbs like potatoes and pasta saved for game days.
Ronaldo has been teetotal since at least 2005 – not only because of the adverse affects on his diet, but also because his father died an alcoholism-related death when he was 20.
His mother, Dolores Aveiro, is a key part of the Ronaldo team.
She often spends time at his house, cooking meals and ensuring they fit his strict dietary needs.
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