Tributes are rolling in for an Adelaide business owner and father of two, who died suddenly while running up Mount Lofty.
Jason Januszke, 43, suffered a cardiac arrest while climbing in the Adelaide Hills on Friday.
The news of his passing was confirmed on social media by his wife, Jess Januszke.
"Tragically my darling husband Jase passed away suddenly yesterday morning, while doing something he loved, running Mt Lofty," Jess Januszke wrote on Facebook.
She has thanked the many people who have reached out to offer condolences and share their thoughts of Mr Januszke as a "remarkable person", "truly one of the best" and "such a good man".
"Thank you for all the messages of love and support over the last 24 hours, I will be wrapping my arms around our two beautiful boys as we try to make sense of a life without him," Jess Januszke wrote.
The owner of Inspire Health & Fitness Studio in the CBD also worked with many AFL players as their personal trainer.
Taylor Walker from the Crows has described the man as a "proud father and close friend", to Adelaide Now, and Port Power players wore black armbands on Saturday in commemoration of the man.
A GoFundMe page set up by friend Cassie Barnes-Young for his family, has already raised around $85,000, as of Tuesday morning.
Photo of Jason Januszke, supplied via Facebook