Trainers are not illegal for single-player use, but they violate 2K’s EULA. Use them offline only and never in ranked or multiplayer modes. They’re best for:
Sky’s the limit. Hit your finishing move, watch your opponent kick out, and immediately hit it again. This turns every match into a highlight reel of RKO’s or Attitude Adjustments.
In the base game, one mistake can cost you a 30-minute Iron Man match. With Infinite Health enabled, you become an immovable object. Your opponent can hit five finishers in a row, but you will kick out at one. This is excellent for: