Joe Wicks says growing up around his dad's heroin addiction left him suffering from anxiety.
The popular personal trainer and chef is set to open up about his troubled childhood during a new BBC documentary Joe Wicks: Facing My Childhood.
Appearing on This Morning to discuss the documentary, Wicks discussed how he was "aware" of his father's addiction.
Talking about the impact it had on him, Wicks said: "Heroin addiction is a really destructive thing. I was just anxious all the time and scared and nervous. I acted up in school. I was disruptive, I was the naughty kid because no one stopped me and said, 'What's going on?'"
Wicks also opened up about his mum's struggles with OCD: "She was scrubbing the house three or four times a day, I was hoovering my bedroom twice a day. I had to show her the lines. These things weren't normal but in my head I was like, 'All mums do this'. Every day was an argument."
He also talked about how his mother would fear Wicks and his siblings would be taken into care if she was open about her mental health issues.
Wicks went on to call her 'brave' for getting help and leaving the family to undergo five months of therapy.
The fitness instructor also elaborated on how those early experiences formed him as a person: "All of those experiences I've been through have shaped who I am today. It's given me that drive and empathy to want to help others and even share this story. There's a reason I'm doing it - I want to help others."
Wicks also revealed the current relationship between him and his parents: "I have a great relationship with my dad today, we've repaired that damaged relationship and the same with my mum."
The documentary is also produced by Louis Theroux who has credited Wicks and his YouTube exercises for helping him during lockdown.
Joe Wicks: Facing My Childhood will air at 9pm, 16 May on BBC One.
Watch below: Joe Wicks receives MBE at Windsor Castle