The Duke of Sussex has appeared in a campaign video about the importance of “mental fitness” ahead of reuniting with Oprah Winfrey.

Harry features in the video, which was shot last summer, talking about Peak State – which describes itself on Twitter as a “global community”.

He is joined in the one-minute clip by the two co-founders with the three providing a voiceover on top of footage of people including the emergency services.

In the video, Harry says: “Peak State is striving to build a global community that understands the importance of mental fitness and feels empowered to attain it.”

He later says in the video: “By providing accessible tools and resources that can be incorporated into our everyday, busy lives, Peak State aims to help people take a proactive approach to the good management of good mental health.”

David Wiseman, co-founder of Peak State, says in the video: “For too long, the term mental health has been used purely in reference to poor mental health or illness.

“We understand mental health exists on a spectrum. And just as a person can look after their body to become physically fit, the same is true of their mind.”

Peake State co-founder Nathan Jones adds: “Inspired by sport psychology and based on the cognitive behaviour and emotional regulation models, Peak State concentrates on the positive aspects of mental fitness.”

It comes as Harry and Winfrey will join participants and experts to host a “town hall” discussion entitled The Me You Can’t See: A Path Forward, which will air on May 28.

Harry’s Archewell website said the programme would begin to answer the question: “Where do we go from here?”

In the series broadcast last week, the duke lambasted the parenting skills of his father the Prince of Wales.

He criticised Charles for expecting his sons to endure the pressures of royal life, and accused his family of “total neglect” when his wife, the Duchess of Sussex, was feeling suicidal amid harassment on social media.

Harry also revealed he turned to drink and drugs as he dealt with the trauma of his mother’s death in later life.

The Archewell website said: “In The Me You Can’t See: A Path Forward, Prince Harry and Oprah Winfrey reunite with participants and experts from the series for a thought-provoking, wide-ranging discussion to build on their initial conversations around mental health and wellbeing.”

“The subjects go deeper into their own stories from the series, the experts share their guidance, and together they begin to answer the critical question: Where do we go from here?”.

It added: “The insightful and expansive town hall features members of The Me You Can’t See advisory board, as well as series participants including Glenn Close; Zak Williams, a mental health advocate and speaker; and Ambar Martinez, an author and OnTrack NY peer counsellor.”

The duke’s future relationship with his father, brother the Duke of Cambridge and the rest of the Windsors has been brought into question following his frank remarks and his and Meghan’s bombshell sit-down interview with Winfrey earlier in the year.