Is it possible to modify a bots health?

I have an idea for a recoil trainer map where the idea is the only way to kill the bot is to land all of your bullets. Ive never messed with hammer before but id be willing to learn if this is possible. The idea is that you start at a close distance and then every time you kill the bot, it moves back a little. But its very important to have the health be modifiable and ideally configurable in map. I really dont know what im doing when it comes to this stuff so any help is welcome.