I plan on living similarly as a Spartan warrior would have lived. Reasons and possibility aside, I very much want to know what possible consequences may await me. The training would include enduring cold weather, very straining exercises to improve stamina and pain resistance, fighting, "all-night" meditation, physical punishment to promote discipline, and a minimum of food, alongside some other living habits.

Do not worry, I don't welcome death with open arms, or at least am not willing to die while training. I have experienced shortage of food for many years, but now I am somewhat fat.
So, I am very curious to hear your answer.