Michael Mosley during his astonishing final documentary

In the last documentary featuring Dr. Michael Mosley, the well-known health expert was shown happily participating in a cold water swimming session.

Recorded in the previous year, the three-part show on Channel 5 follows the ex-writer for the Mail as she explains the wonders of the human body. She uncovers the reasons behind why bones become fragile with age and explores cutting-edge treatments for cancer.

Dr. Mosley, who passed away at the age of 67 due to heat exhaustion during his vacation in Greece, closely examined his own body for the documentary.

During the initial episode, airing at 8pm on Thursday, the doctor courageously agreed to challenge the natural elements by going for a cold water swim.

Dr. Mosley talked about how he was trying a new approach to improve bone health by taking a refreshing swim in the water.

In the last video featuring Dr. Michael Mosley, the health expert was captured having a great time while participating in a cold water swimming session.

Engaging in exercises that put pressure on your bones can help maintain their strength. However, there are also advantages to participating in activities like swimming, as he mentioned.

After that, Dr. Mosley went to the Ayrshire coast to meet some enthusiasts of cold water during the show.

One Scottish woman admitted that when she first got in, she couldn't believe how cold it was. She and a group of ladies did some warm-up exercises before braving the chilly waters of the sea.

Although it may be challenging initially, the cold water swimmer referred to the teeth chattering experience as 'completely freeing,' while another person described it as 'magical'.

The courageous team of winter swimmers were spotted gliding through the icy water with determined expressions, smiling and playing around as they embraced the cold shock.

By utilizing a thermal camera, swimmers could examine their body temperatures prior to diving into the water.

Dr. Mosley described the difference. He said that their skin initially started at approximately 22 degrees, but after only 15 minutes, our thermal camera showed that their skin temperature had decreased to 10 degrees, which is almost as cold as the ocean.

We often hear about the activity of swimming in cold water, but have you ever wondered about the effects it has on your body? What advantages does it offer for your health and what potential risks should be considered?"

The late Dr. Mosley, who passed away from heat exhaustion at the age of 67 during his vacation in Greece, examined his own body closely for the documentary.

Returning to London, Dr. Mosley decided to personally test out the cold therapy method. He arrived at a freezing cold bath in the city fully prepared in a wetsuit.

Dr. Mosley explained that swimming in cold water causes your blood vessels to become smaller, which means your heart has to work extra hard to push blood through them. This helps to make your heart stronger.

The dive also triggers chemicals that are believed to speed up your body's metabolism and improve your mood.

Certain frequent swimmers even argue that it can boost their immune system, preventing them from catching the common cold.

Returning to London, Dr. Mosley decided to experience the cold immersion technique firsthand. He showed up at a cold bath in the city dressed in a wetsuit.

"I have to confess, I feel like a bit of a fraud with everything going on right now," he admitted. But the physiologist reassured him that it would still be effective, even with everything else happening.

Dr Mosley inquired about the best way to enter the cold water. He was advised to gradually acclimate to the cold in order to prevent straining the heart.

The expert stated that it can be stressful for a tropical animal to go from being in warm 28 degree air to suddenly being in 12 degree water.

When Dr. Mosley tested the water with his foot, he couldn't resist exclaiming, "Wow, it's icy!" He then cautiously entered the pool, taking slow breaths to adjust to the temperature.

Dr. Mosley, who passed away due to overheating at the age of 67 while on vacation in Greece, analyzed his own body closely by conducting various experiments. These tests focused on his heart's condition, saliva production, and how well his body reacted to a quick plunge into icy waters.

With a mix of discomfort and amusement, Dr Mosley extended his reach all the way to his thigh and wrapped his arms around his shoulders.

Once he got used to the cold, Dr. Mosley confidently began swimming with a breaststroke, smoothly gliding through the pool even though the water was cold.

In other parts of the documentary, Dr. Mosley visited Fife to meet Thomas, who was dealing with a common neurological disorder and was getting ready for groundbreaking surgery on his brain.

The 71-year-old was diagnosed with essential tremor, a condition that impacts around one million people in the UK and results in uncontrollable shaking or trembling.

However, Thomas started experiencing symptoms in his forties when he first observed trembling in his right hand.

In his late thirties, his hands and head started to shake, and the shaking only got worse as he got older.

Michael Mosley, who passed away this summer while vacationing in Greece, experimented on his own body in a three-part series. He tested his heart health, saliva production, and even braved a freezing dip.

To try a new tool for predicting heart disease, the ex-Mail writer volunteers to undergo a procedure in which dye is injected into his bloodstream to highlight his blood vessels on the CT scan.

In the documentary, Thomas traveled to Dundee to undergo a surgery that could greatly impact his life.

The new technique involves directing a focused beam of ultrasound waves to eliminate a small group of cells in a region of the brain known as the thalamus, which plays a role in controlling movement.

Doctors are optimistic that this treatment will act as a circuit breaker, preventing Thomas's brain from sending an excess of confusing signals that lead to his uncontrollable tremors.

Equipped with a head brace to make sure he stayed in place, Thomas was kept conscious during the procedure to prevent the beam from affecting the areas of his brain responsible for speech.

If it deviates even slightly, he may lose the ability to talk or become paralyzed.

After each ultrasound, Thomas' doctors tested his brain function by asking him to draw a spiral on a piece of paper.

The three-part series aims to unravel the wonder of how the human body is designed and engineered, encouraging viewers to perceive our bodies in a fresh light and comprehend the way they function and evolve as we grow older.

In the beginning, he struggled to even create a single mark on the paper. However, after practicing seven times, his hand steadied enough for him to successfully draw a complete spiral.

"I feel really thankful," Thomas stated, "I could see a difference immediately. I have progressed much more than I expected. It will truly have a major impact on my life."

In the following part of the show, Dr. Mosley encountered Allen, a 76-year-old man who was eagerly awaiting the results to find out if his unconventional cancer treatment had worked.

A few years ago, Allen was told he had stage 4 lymphoma, which is a type of blood cancer.

He described how they told him there wasn't many options for treatment.

Before doctors identified his illness, Allen worked as a police officer in London. He also served as Princess Diana's personal bodyguard for nine years.

He began to experience signs of his cancer after he moved to Dorset and at around the same time, a Ukrainian refugee family moved in with him.

Following the host's diagnosis, they made the choice to remain and provide assistance with their care.

Allen mentioned that he had already organized and covered the expenses for his funeral. He believed that his time was limited and didn't expect to be alive for much longer.

However, Allen received a new opportunity from his medical team in Southampton. They offered him a treatment called CAR T-cell therapy.

In the series, the doctor kept searching for answers to important questions like why our joints start to feel stiff, what happens when we get the flu, ways to keep our brains healthy as we get older, and the process of replacing a hip.

The groundbreaking cancer treatment boosts the body's natural defenses to help detect and combat cancer cells.

T-cells, known as the body's defense cells, are taken out, altered in a laboratory, and then put back into the bloodstream.

These modified cells are now equipped with a heightened ability to locate and destroy cancer cells.

The method doesn't work for everyone, but Allen was fortunate enough to receive great news during his appointment: he was completely cancer-free.

Before, his scans were filled with cancerous growths, but now they are coming back clear.

Dr. Mosley shared that advancements in treatments have greatly increased our chances of surviving cancer, with the likelihood being six times higher than it was four decades ago. However, it is still a sobering fact that one out of every two individuals will receive a cancer diagnosis during their lifetime.

Equally amazing advancements in technology have been developed in recent years to address another significant health issue for the British population - cardiovascular disease.

Around 25% of all deaths in the UK are caused by heart and circulation issues.

However, a recent study conducted by experts at the University of Oxford suggests that they have created a test that can identify heart issues well in advance of any noticeable symptoms.

By examining the fat that envelops the heart's blood vessels, researchers can identify initial signs of inflammation in the arteries, which may suggest a future heart attack.

To try it, Dr. Mosley volunteered to undergo the procedure. This involved having a special dye injected into his veins to make his arteries visible on the CT scan.

To conclude, Dr. Mosley explored the reasons behind the increased fragility of our bones as we get older.

He went back to the University of Oxford to learn more about bone health from Professor Sue Black.

She described how bones may appear strong on the outside, but are actually active and moving internally.

As we get older, the hormones like estrogen that nourish these bone cells start to decrease.

After going through menopause, estrogen levels decrease which leads to a rapid weakening of the bones.

Tiny cracks start to appear, but often do not get better on their own. This problem, called osteoporosis, is very widespread, impacting about 20% of women and 5% of men.

To keep our bones strong as we get older, it's important to make sure we're getting enough calcium and vitamin C in our diets. We should also incorporate activities like running and dancing into our exercise routine to help build and maintain bone strength.

The show ends with Dr. Mosley agreeing to have a small camera put up his nose to look at his vocal cords - and uncovering the surprising truth that humans make enough spit every month to fill up a whole bathtub.

In the upcoming episode of the documentary series, he will explore hip replacement surgeries, stress management, and three simple activities you can do at home to lower blood pressure without needing a gym membership.