Danny, F ifty feet. The Big One is the UK's tallest roller coaster. She says one hundred and fifty feet. I agree that we are high. Oh God! A terrible thing! The carriage plummets back to Earth after reaching the track's apex.

A friend and I went to the Pleasure Beach to scare myself. It's said that fear is as good for mental wellbeing as it is for physical health. I hope exposing myself to fear will help me deal with my fear of public speaking. Everything looks a little sharper after we leave the ride.

Margee Kerr, the author of scream: chilling adventures in the science of fear, says that one of her best friends is a yoga instructor. We are trying to get to the same place via two different routes. I fear myself when she goes through the focus meditation. The body says that we need to focus our energy and resources on survival, so we're just going to turn down all that inner dialogue and be here in the moment.

Kerr is a sociologist and she wrote a book about fear and why it's important. She stays overnight in an abandoned prison and braves the Edge Walk at the tallest skyscraper in the world.

The Big One, at Blackpool Pleasure Beach, is Britain’s tallest rollercoaster

Long way down … the Big One, at Blackpool Pleasure Beach, is Britain’s tallest rollercoaster. Photograph: Christopher Thomond/The Guardian

Kerr was a fan of horror movies and haunted houses as a child. I think that was the reason I was interested in the first place. Trying to understand why people do scary things. Why do I enjoy scaring people?

Yeah, well? There are so many reasons. The natural high is the physical high. When our sympathetic nervous system increases activity and circulates hormones that make us feel strong and powerful, people talk about all the changes in the body.

Some therapies try to expose people to things that scare them in order to get them out of their comfort zone. Exposure therapy helps patients face their fears in a safe environment. The dropout rate can be as high as 50% if Kerr's work is anything to go by.

Virtual-reality environments can be used for therapies such as a crowded train filled with hostile passengers staring at patients. They are not being told to be quiet. They are being told that they are capable of laughing and screaming. There is a subway car full of humans. Humans should not be as scary after doing a fun, scary experience.

The EdgeWalk at the CN Tower, Toronto

On top of the world … the EdgeWalk at the CN Tower, Toronto. Photograph: Sipa US/Alamy

The only difference between fear and excitement is how we frame them. The same chemicals will be produced by being spun around on a roller coaster and being confronted by a bear.

You can get the benefits of fear if you get it in the right place. It can bring people closer together if there is a positive bond between people in groups. We form strong memories when we do emotional things because we want to remember the good times.

Kerr believes that chronic, everyday fears may explain why we seek out more in-your-face threats. The joy comes after the event is done. It feels like the threat has passed and I can relax.

The fight-or-flight response is handled by the sympathetic nervous system and the parasympathetic nervous system is responsible for the sense of presence we feel after it has passed.

Kerr leaned into her harness on the edge of the 553-metre tall building and into the Toronto sky. She was overwhelmed with fear after experiencing her body in a completely new way. She can use that day as a reference point in times of stress. I think about that moment and it makes me feel good. I think it taps into some kind of physical memory where I remember I can do this. I really enjoy having that memory. I want everybody to have a very intentional memory that gives them strength.

I try to do as many scary things as possible after our conversation. I would recommend doing something that scares you at least once in your life because there isn't enough research into how often one should experience acute fear. It might make you feel better.

Rollercoasters

Icon at Blackpool Pleasure Beach

Twisted idea of fun … Icon at Blackpool Pleasure Beach. Photograph: Christopher Thomond/The Guardian

The UK's tallest roller coaster makes me want toTrademarkiaTrademarkiaTrademarkiaTrademarkiaTrademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia.Trademarkia There is a different ride at the Pleasure Beach that is more suited to Kerr's fear good factor. It is terrible and excellent.

My experience is not going well. Two people convince me that my harness isn't secure. One of them tries to get me in, but his colleague is going to sort it out. He doesn't touch the harness. He winks and we are off.

Lucy and I hurtle out of the platform, leaving my face bloodied. I am going to die, that is what I am going to say. As I slip in my chair, I said. I make Lucy laugh and laugh. The soundtrack to my death makes me laugh. I don't die and I feel calm when it's over. A cup of tea would have done the same thing.

The fear factor is 5.

Pasaje Del Terror

Pasaje Del Terror, Blackpool Pleasure Beach

A frightful place … Photograph: Travelib Culture/Alamy

People pay a lot of money for strangers to startle them in the dark, usually in labyrinthine corridors, where performers re-enactment famous scenes from horror films

The Pleasure Beach has Pasaje Del Terror as well. I am nervous as Lucy and I enter the dark passage together. Lucy nominated me to lead our group.

The lack of real danger is taking the sting out of everything, but I am completely unmoved. The women behind me got what they paid for, with hugs and kisses at the end, no doubt thanks to their parasympathetic nervous systems.

The fear factor is 2.

Midnight in the woods

Man’s silhouette in a dark forest

In for a big surprise? Photograph: MarioGuti/Getty Images

John Yorke believes that every story can be reduced to a journey through the woods after dark. I decided to sit on a fallen tree trunk and watch a horror film on my phone in the middle of the night. It's not lost on me that I'm the scariest person in the woods right now.

I saw faces in the darkness as I made my way out through the thicket. When I get to a quiet suburban cul-de-sac, my sympathetic nervous system is on point.

The fear factor is 3.

Climbing

Man hanging from a rockface

Don’t look down … Photograph: Tom Hoyle/Getty Images

Climbing makes me afraid of heights and falls.

It is a wet and foggy Saturday morning when I boulder up the side of Indian's Head, which looks like a Native American chief. I am exhausted as I get to the top. I don't need a climbing rope, a harness or carabiners because the rocks are about 15 feet high.

As I reach halfway up the rock I chose, I start to doubt if this is true. I can't climb down because I have run out of footholds and hand holds. I can either drop to the ground or cling on until rescue arrives.

I choose the former and press my torso to the rock face as hard as I can, to create as much force as possible as I slide down and land safely on my feet, even though I bruised my heels. I would have fallen down the boulder city behind me if I staggered back just a bit.

I felt scared and stupid here. I'd find a climbing wall and an instructor for you.

The fear factor is 5.

Abandoned building

Daniel Lavelle at an abandoned mill

On edge … Daniel at the mill. Photograph: Joel Goodman/The Guardian

There is an abandoned mill at the bottom of a bridle path next to my house. It has a Victorian feel to it.

I don't fear ghosts because they don't exist, but what is there to be afraid of? They can't hurt you. They can't do anything worse than startle you and make you question your sanity. Being a ghost isn't the best form of the afterlife. Some people in old houses can see ghosts at night and they scare people.

The Victorian architecture makes me feel like someone is watching me. My brother and I enter what remains of the mill's interior through a rotting wooden door and move slowly under torchlight. When I feel something on my shoulder, I say, "So we're not the only ones to have come" The bat poo doesn't stop me from fleeing the mill as a colony of bats fly above. We are going to return to the bridle path.

The fear factor is about as high as possible.

Down and Out is a book by Daniel Lavelle. You can order your copy at guardianbookshop.com. Delivery charges can be applied.