A teenager has died in hospital after he was crushed by a 98kg bar weight during a workout at a gym in Brisbane.

A teenage boy has died after he was seriously injured in a tragic incident at a Brisbane gym earlier this week.

Ben Shaw, 15, suffered serious injuries when he was crushed by a 98kg bar weight at the Pine Rivers PCYC gym on Wednesday.

Ben's football club, the Pine Central Holy Spirit Hornets, released a statement on social media confirming the boy had died.

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"Yesterday afternoon they (the Shaw family) lost their beautiful Ben and has been able to leave a legacy by donating his tissue and organs to enable recipients have their lives saved and changed forever as a result," the Facebook post said.

"As a club we will be assisting to see the world through Ben's eyes and ensure his legacy lives on in support of his parent's and family."

On behalf of Pine Central Holy Spirit Rlfc I would like to send our heartfelt condolences to the Shaw family. Yesterday...

Posted by Pine Central Holy Spirit Hornets on Saturday, 30 September 2017

Tributes have flowed on social media as dozens of people offered their condolences to Ben's family and friends.

"You will be missed by many," wrote one.

"My daughter said you were there for her when needed, no one will forget you"
Another said Ben's light would "shine bright through his organ recipients".

"Take some comfort & strength in knowing that Ben's life is going to change many lives," they wrote.

"Such a beautiful decision to donate...."

Bray Park Oztag also sent their deepest sympathy and love to the teen's family and close friends.

"It's with an absolute heavy heart that yesterday we lost one of our team mates, one of our friends, who passed away peacefully in hospital surrounded by his loved ones," the club said via social media.

On Thursday, a local mother-of-four, who did not want to be named, spoke of the horrific moment her husband discovered Ben trapped under the bar.

"When he got there it was quiet, there was nobody around and he was about to start his workout when he looked over and saw the 15-year-old boy just lying on the bench with a bar right across his neck," she told Seven News.

She said her husband "immediately rushed over" to help Ben.

"He grabbed the bar off his neck and yelled for help," she said.

The gym where Ben Shaw was injured is closed until further notice. Photo /PCYC Pine Rivers
The gym where Ben Shaw was injured is closed until further notice. Photo /PCYC Pine Rivers

Two other members of the gym performed CPR until paramedics arrived at the scene.

It is understood Ben was trapped underneath the weight for up to 30 minutes before he was found.

"I still don't understand why the staff weren't around," the woman said.

PCYC is assisting Work Safe Queensland with its investigation into the incident.