The nineteenth series of the celebrity dancing competition begins in September, and Webb was amongst the first three contestants revealed.
"Did I ever expect [to compete] ... err, I dunno! ... It was always in the stars, it was going to happen."
In 2009 Webb competed in - and won - the first series of Let's Dance For Comic Relief with a routine based on Hollywood film Flashdance.
Webb, who is recovering after undergoing serious, emergency heart surgery last year, continued: "I suppose it is part [of recovering]. You get to a point in life where you think 'this is no time to be cool' and these experiences don't come along every five minutes so suddenly it felt rude not to [take part]."
He added: "I wouldn't say it's an obvious way to recover from heart surgery, they don't put it on the website!"
Fifteen celebrities are due to compete in the "full-length" Strictly Series 19 after 2020's competition was curtailed due to the coronavirus pandemic. It will launch in September on a date yet to be confirmed. The professional dancing partners of each competitor have also yet to be announced.
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