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A young woman said that she almost lost a leg after taking a high-intensity spinning course.

23-year-old Kaelyn Franco revealed on TikTok at the end of last month that she had been diagnosed with rhabdomyolysis, a potentially fatal disease that involves the breakdown of muscle tissue.

Franco's TikTok video-which has been watched 3.5 million times-shows a photo of her swollen left leg taken after the course.

"It's not that I think I gained muscle through spinning courses," a native of Massachusetts wrote.

Her video was then dramatically cut into a photo that showed her lying on a hospital bed with a tube coming out of her body.

"It's not that I almost lost my leg and life the next day," she wrote.

Like part 2 #greenscreen #rhabdomyolysis #spinclass #compartmentsyndrome #fitness #fyp

In the video that followed, Franco explained that the doctor diagnosed her with rhabdomyolysis-commonly referred to as "rhabdomyolysis."

According to the Centers for Disease Control and Prevention, striated muscle occurs when damaged muscle tissue releases proteins and electrolytes into the blood. These substances can damage the heart and kidneys and cause permanent disability and even death. "

Symptoms of striated muscle include severe muscle cramps and pain, and dark urine that is usually cola-colored.

In another Instagram post, Franco explained that when she got off the spinning bike, her legs "curved immediately." Her legs then swelled up and her urine changed color.

She said that a few hours later, she "cried in pain" and went to the hospital, where the doctor diagnosed her with rhabdomyomas and underwent "emergency surgery."

"I can't walk or move, I have to plug in a catheter," Franco wrote in her painful Instagram post. "My striated muscle became acute compartment syndrome (a condition caused by pressure buildup caused by swollen tissue and internal bleeding)."

The doctor was finally able to save Franco's leg — "and my life," she declared — by cutting off the muscles that had broken down into her blood.

A post shared by Kaelyn Franco (@kofranco_)

However, Franco said she will suffer "lifetime complications" due to a medical incident.

Approximately 26,000 people develop striated muscle every year. In 2016, the American Medical Journal published an article entitled "A Public Health Concern". Spin-induced rhabdomyolysis. The focus of the study was on three people who had this situation after the spinning class.

The study concluded that: "The high-intensity exercise associated with the rotation course poses significant risks for novices."