Dave Benson, from Worthing radio station Splash FM, was seen burning up the calories when he attended the recent Go Bananas! taster day at Lancing Manor Leisure centre.
The keep-fit event, organised by Adur District Council, attracted more than 100 people.
Throughout the afternoon, a person dressed as a giant banana was spotted taking part in the free exercise classes.
The costume was provided by Fantasia, the fancy dress hire shop based at Thomas A'Beckett in Worthing.
Promotions and publicity officer Steve Fletcher said: "I was pleased to see so many people enjoying exercise, which, after all, can only be good for you.
"It was also great working in partnership with local business people in order to serve the community."
Andrea Simpson from Lancing won the free prize draw for one month's free exercise classes at the centre.
For details of classes, call 01273 263300.
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