This was reported by the press service of the Main Investigative Directorate of the Investigative Committee of the Moscow Region.
According to her, a pre-investigation check is being carried out.
The UK said that on November 18, while exercising on a treadmill, a man slowed down, "suddenly fell onto the belt of a treadmill, and then slid off the said belt onto the floor."
Investigators ordered a forensic examination to establish the cause of death, seized CCTV footage and interviewed eyewitnesses.
In June, the prosecutor's office organized an investigation into the discovery of the body of a 26-year-old man in a fitness club in southeastern Moscow.