Woman steps off the back of a treadmill and fatally falls out of a three-story window.

NEW: Woman steps off the back of a treadmill and fatally falls out of a three-story window.

Devastating...

The incident happened in Pontianak, Indonesia while the woman was working out.

The 22-year-old victim had reportedly been exercising for about 30 minutes when she stepped off the back of the running machine.

According to police, there was only a 2-foot gap between the machine and the open window.

The window height was only about a foot.

The woman tried grabbing the edge of the window but it was too late. She was rushed to the hospital where she was pronounced dead.