Awesome as the trainer is, there is a problem. When I activate the unlimited health cheat, all npcs also have unlimited health.
I fiddled with the trainer a bit, if you activate no fall damage then peds have unlim health. Every other trainer feature does not do this. I just stay away from the No Fall Damage feature. However I may be wrong as I only tried this once.
Activated the non health editing functions eg no reload and each time I activated something I'd try kill a PED. If they still died, I'd activate another.
Anyways I got to no fall damage, with all the other features activated I activated it and the PEDS were invincible. Deactivated and they died normally again.
Hope It helps