The world's fittest pensioner is refusing to take it easy in 2013 - tackling THREE major fitness championships at the age of 93.

Sprightly Charles Eugster - a body builder and rower - will be the first person to enter all three challenges and is determined to succeed in each one.

The retired dentist decided to start running and rowing at the age of 85 after noticing he was putting on weight and losing muscle.

He joined a body building club and began three intense work outs each week - before enlisting the help of a personal trainer aged 89.

Dr Eugster has even been able to start creating new muscle - something that gets harder with age - as well as picking up medals at fitness competitions around the world.

WATCH: 86-Year-Old Gymnast Perform At World Cup In Germany

This year, he will tackle the World Masters Rowing Regatta in Italy, the World Masters Athletics Championships in Brazil and the European Strenflex Championships in Switzerland.

Grandfather-of-two Charles, who lives in Uitikon, Switzerland but was born in London, said his next goal will be to have a beach body at the age of 94.

He said: "Exercising is like brushing your teeth or washing.

"If you don’t do those things, something nasty happens. Staying fit at 60-plus is vital for quality of life.

"My main motivation to start was because I was losing muscle mass, my body was deteriorating and I was very vain.

"I wanted to turn the heads of the sexy 70-year-old girls on the beach.

"I've never done athletics before, it was something new. I take the ideas to show people that you can start something new at any age, it doesn't matter how old you are."

Could these tips help you stay in shape?

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  • Take regular exercise

  • Engage socially with others

  • Have a positive attitude about ageing

  • Eat a healthy diet

  • Protect your eyes

  • Don’t smoke

  • Get regular health checkups

  • Avoid excessive sun exposure

  • Get sufficient, good-quality sleep

  • Pay attention to your pension, and get expert financial advice

Charles, who was born in 1919, began a gruelling workout regime at the age of 85 and became a fitness ambassador for a gym chain five years later.

He lost almost two stone in the first year of working out and now works with a personal trainer to keep up his hard work.

They continuously experiment with different training regimes, diet and natural food supplements.

Charles, who has two grown up sons, added: "There is very little information about training methods, diets or parameters for the healthy aged above 70.

"This means we are exploring an unknown field.

"What we have planned for this year is something new, we want to see if I can take part in an athletic competition, the World Masters in Athletics.

"We are trying to train me for 100m running, something I have never done before.

"I might consider swimming. If I can develop my swimming technique I will also try to take part in a men's international competition.

"The secrets of healthy old living are three factors. One is work and the other is nutrition and the third is exercise in that order.

"What I hope to achieve is to change the world. Get a new body and start a new life."

Charles will compete at the World Masters Rowing Regatta in September in Varese, Italy.

Then in October, he will tackle the World Masters Athletics Championships in October in Porto Alegre, Brazil - 50m freestyle swimming, 100m sprint, shot put and discus.

In 2008, he won the World Strenflex Decathlon Championships in the 80+ category, as their oldest contestant.

A year later, Charles won the Van Der Merwe Cup, an international fitness decathlon in Switzerland, with the highest number of points scored in any age group.

In November 2009 he was crowned Strenflex Swiss Champion, scoring higher in each exercise than previously and in 2010 he racked up the highest number of points in a Strenflex competition.

Related on HuffPost:

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  • See A Doctor First

    This may seem like a no-brainer, but if you've been idle for a while, it's important to see a doctor before getting active again, says Dr. Alexis Colvin, an orthopedic surgeon at The Mount Sinai Medical Center in New York City. You want to make sure you don't have any pre-existing conditions, such as heart disease, that might present a problem when you start up your new exercise regimen.

  • Start Slowly!

    Getting active too quickly, often with incorrect form, is one of the primary reasons people over 50 find themselves in her office, Colvin says. It's important to slowly build a base level of strength, flexibility and fitness before pushing yourself to, say, sign up for that marathon.

  • Consider Seeking Professional Help

    It's always helpful to have a little direction and support in starting something new. Colvin suggests getting started with a personal trainer or physical therapist to tailor an exercise program to your goals.

  • Get In A 'Pain-Free Zone Of Activity'

    Low-impact activities, such as swimming or using the elliptical, are all good for people who have joint pain, says Dr. Colvin. If it hurts, don't push it!

  • Think Beyond Cardio

    An active lifestyle isn't limited to throwing on some running shoes and hitting the pavement. Dr. Colvin suggests yoga and pilates, which can help with strength and flexibility even if they don't give you the same cardiovascular workout you might get from the treadmill.

  • Think Outside The Box...Or, Should We Say, The Gym

    Colvin also points to the many home exercise videos available, which can be a great alternative for those who would prefer to exercise from the comfort of their living rooms. The one drawback, she says, is potential for injury from using incorrect form, "since there's no one watching you."

  • Consider Cross-Training

    Mix up your routine and <a href="http://sportsmedicine.about.com/od/tipsandtricks/a/Cross_Training.htm" target="_hplink">consider cross-training</a> (adding swimming and biking to a running program) to prevent boredom, avoid repetitive injuries and improve your overall condition. Exercise with friends to add social benefits to the physical and mental advantages of your workout. Recognize your limits, adjust accordingly and enjoy the quality-of-life benefits of an active lifestyle for many years to come.