This is the Guardian.

Hi, my name is Hannah Frankson. I'm a peloton instructor and I teach classes on the peloton bite and the peloton tread.

Nothing motivates me more than the thought of enjoying life to the fullest.

Life is always for so many different challenges and chapters.

For me movement and exercise has been there throughout every stage of my life. Just living life to the max is what motivates me.

The Guardian loves has partnered with peloton to help you find motivation that moves you.

To find out more visit the guardian.com forward slash motivation with peloton.

This message was paid for by peloton.

Welcome to the Guardian Long Read.

Showcasing the best long form journalism covering culture, politics and new thinking.

For the text version of this and all our long reads go to the guardian.com forward slash long read.

The long disorientating search to diagnose my mystery illness by Will Rees.

Read by Dermott Daily, produced by Tony Onachuku.

Some time ago while riding the tube I came across an advertisement that stood out among the familiar roster of ads for nutritional supplements and blended Tennessee whiskey.

This was in the days before the pandemic emptied rail carriages and transformed indoor public spaces into chambers of contagion.

Unfolding across several posters it went like this.

Explore risks that may be common in your family tree. See how DNA affects your health. Put your worries to test.

The advertisement was clearly suggesting that the knowledge it sold would be beneficial to the customer, although why and in what ways were questions on which it demured.

Not mitigate or minimise, but explore risks.

The claim seemed to be that knowing about one's genetic predispositions to disease would be inherently good.

Knowledge itself would be improving.

Yes, I thought. I could see myself doing that in the spirit of exploration.

...