Boxing 4x a week, better cardio, explosive power — and the results persisted two weeks after stopping

Two cycles of Spartan ZP (December 17 to January 30). Today being February 11th, I can still feel its power growing inside me. Boxing four times a week is now a habit — before Spartan, there was no boxing for years. My stamina is noticeably better, cardio improved significantly, explosive power is up, and my technique is developing fast. While boxing I get short vivid mental movies in my head — like a movie trailer with special effects, music, slow motion — giving me rushes of pleasure during training. I've lost weight and body fat. Multiple people noticed I looked thinner. Some of my pants simply fell off while I walked.