C172 pilot practicing emergency spiral procedures reported descending below MSA for the area and immediately climbed to a safe altitude.

Narrative

I was at 4;000'MSL practicing emergency spiral procedures; I spiraled down to about 2;600'MSL and followed with an engine out procedure. I set my airspeed; picked the best place to land; did a simulated cockpit flow/checklist; I was practicing teaching this for my CFI checkride this week. I was talking about landing procedures in relation to the wind the effects different settings can have on landing; I started to simulate a course around my field of intended landing while talking/teaching about it. I looked down and noticed my altimeter reading 1;100'MSL. Which I believe is either barely on or less than 100' below MSA. I instantly initiated pull power and climbed out. I was not close to any obstacles and posed no hazard. I just believe I may have dipped below MSA in an open field. I believe this was caused by distraction and fixation on teaching the maneuver rather than performing it. This taught me to remain vigilant as to what I am doing rather than what I am saying; and always put safety as the number one performance priority.