The safety of a Fling trainer depends entirely on the source.
Fling trainers typically offer a variety of togglable options, often mapped to the Numpad: How to download FlingTrainer for Borderlands3
A trainer is a standalone executable program designed to intercept a game's active memory (RAM). By changing specific memory addresses, it can "freeze" values like health meters or ammo counters, effectively allowing players to bypass difficult sections or experiment with game mechanics. Fling is one of the most recognized creators in this space, known for providing a lightweight, user-friendly interface with hotkey support. Is it Safe to Download?
