In what a family member calls a “bizarre accident,” Delrie Rosario, 36, a mother of four, died after falling on a treadmill at an LA Fitness Center in Washington, according to Kiro 7.

Rosario was running alongside her sister, Marissa Woods, something they did nearly every day, according to the report, when she reportedly fell and hit her head on the front of the treadmill.

"She tried to slow the machine down. I thought maybe she just missed a step. She just collapsed, [and] hit her head on the machine," Woods told Kiro 7.

Woods said her sister lost consciousness and she called for help. She told the outlet that no one at the gym knew how to administer CPR, but other gym-goers stepped in to help. Rosario later died at a hospital, according to Kiro 7.

“A mother first. Always everything she did was for kids. She worked so hard for kids,” Woods told the outlet.

Rosario’s friends and family set up a.

"How big can your heart be to still be saving lives?” Woods told Kiro 7, "Just think, somebody’s walking around…with her big heart. They don’t even know what heart they’re about to get."

Rosario’s friends and family set up a GoFundMe Obscure Olympic Rules You Didnt Know Existed.

More than 400,000 people are treated per year for injuries related to exercise equipment, according to a 2019 David Roche Smashes Leadville Course Record.

Delrie Rosario hit her head on a treadmill during a workout at an LA Fitness center Runner’s World.

Headshot of Rosario’s friends and family set up a

A Part of Hearst Digital Media Runner’s World, Best Recovery Shoes The Runner’s World Vegetarian Cookbook, and a nine-time marathoner with a best of 3:23. She’s also proud of her 19:40 5K and 5:33 mile. Heather is an RRCA certified run coach.