Authorities are investigating a stabbing that took place at a Planet Fitness gym in Gardner, Massachusetts on Wednesday morning.
Police say they responded to an assault and battery at the gym on Victoria Lane.
When officers arrived, they found a 43-year-old man with a stab wound to the chest, authorities say.
According to police, the man was transported to UMass hospital via Life Flight.
Nunez Lennox, 19, of Revere, was arrested and charged with assault and battery with a dangerous weapon.
Lennox is expected to be arraigned today in Gardner District Court.