The 37-year-old struck gold in the men's individual PT2 class at Rio 2016 but will now launch a business to support mental health at work.

Bespoke Mentoring will work to support organisations to get the most out of their staff, by investing in their mental health.

Lewis' retirement comes with the Tokyo 2020 Paralympic Games postponed until next year due to the coronavirus pandemic.

He was involved in a motorbike accident at 16-years-old, where his right leg was initially saved.

However, he later had it amputated at the age of 22 due to a number of complications.

Lewis then took up Para-triathlon in 2013 with world and European gold among his other achievements.

"I can change people's lives, and it's time for me to make good on my word," he said.

"There is nothing more important than your mental health, nothing. 

"And I want to use my experiences to help people monitor, manage and improve it. 

"Whilst I learnt the very hard way, I'm grateful for the lessons which have made me ten times stronger than I ever could have been. 

"Nothing has levelled me yet, and that kind of resilience is what makes you successful, whatever your measure of that is.

"Plus in a time of isolation, remote working and homeschooling, so many companies feel helpless as they watch their employees struggle with this new normal. 

"Motivation and mindset are muscles which need training like anything else. 

"That's why Bespoke Mentoring was born."