The real sin occurs when a player joins a random public co-op session with a trainer active. Teleporting to mission objectives, killing everything before teammates can react, or being invincible ruins the shared narrative. It transforms co-op into a spectator mode for the cheater’s private movie. The community consensus is clear: trainers are for solo or consenting friends only.
The trainer typically offers a suite of options that can be toggled using hotkeys (often Numpad 1–9) Combat Enhancements : God Mode (Infinite Health), Unlimited Ammo, and No Reload Weapon Handling
Skip the "grind" of collecting supplies to upgrade gear.
Like most game trainers, anti-virus software may flag it as a "False Positive" because it injects code into the game’s memory.