Club coach Lynette Morrow said the event included a gymnastics display and presentations.

She said Australian national level 10 champion Megan Silvers also displayed her routines.

Mrs Morrow said Minister for Sport and Recreation Hugh Delahunty launched the opening.

She said several people joined in the event.

"It was jam-packed. There was no seating room left," she said.

"We couldn't fit everyone in."

Mrs Morrow said the launch was also an opportunity to thank everyone involved in the $145,000 extension project.

She said the State Government put $60,000 towards the project.

Horsham Rural City Council contributed $10,000 and the club provided cash and in-kind contributions of more than $79,000.

Mrs Morrow said the gymnastic display also went well.

"It was a successful day and probably the start of bigger and better things," she said.

Mr Delahunty said the project marked a new era for the Wimmera's gymnasts.

He said it included an extended gym floor and higher ceilings to cater for more activities and trampolining.

"This project is great news for the Natimuk and District Gymnastic Club's growing membership, which includes students from district schools who can now continue to test their agility and develop their gymnastics skills in a new and improved facility," he said.

"The extended space provides the perfect place for the Natimuk district to come together and stage bigger and better events, encouraging more people to become more active, more often."