a2:
I was an MTI at Lackland in the early 80's. An MTI will be your Drill Instructor. Running is no big deal, if you run a mile a day, you'll be fine. The rest of BMT is a snap anyway, the only problem I encountered with the kids going to boot was attitude. If you get home sick easy, you'll have difficulty, if you can't follow directions, you'll eff up.
As some of the others have mentioned, this isn't Marine Boot, or even Army Boot. The Navy has a similar program that isn't so hard. It's mostly acquiring Military Bearing, Listening to and obeying Orders, Teamwork and learning a little bit about leadership.
Most of your training will involve drill. If you know someone that can teach you a little, seek them out and ask. Basic stuff like Left Face, Right Face, About Face. Learn what foot is the right and the left. Be prepared for Flight in-fighting..it's always present. Learn to deal with people or accept it anyway, that some are different than you...their mindset is different and all they'll do is piss you off....it's common within an organization like the Military. Academics will round out the training. Inspections...all simple.
Your TI is God while you're there. So is the Team Member..his/her assistant. Always keep your 341 in your pocket and never leave your rack/bunk a mess. If you...and you will, pull Dorm Guard, stick to the procedures, don't get flustered even when the person at the barracks door threatens you with death. All they're trying to do is confuse you...Procedures Procedures.
Your Firearm training will be rediculous unless your AFSC is SP/LE or some other jobs. That will take place at Tech School anyway. Never salute an enlisted person, only Officers and ONLY your TI when you have to report to him in the Barracks Office...that's training only. Not sure if they do that anymore.
Learning the difference between Sir and Maam...Reports versus Reporting....The common way to respond when a TI summons you is...Sir/Maam "Airman Schmuck Reports as ordered.....not reporting.
Tons of other stuff....but it's really a breeze, nothing to it. If you chose and were accepted to some of the more rigorous jobs like, ParaRescue, Command and Control, Combat Air Weather and a few others, that's where the training gets much tougher. I was a Combat Air Weather known as Para Weather back then and a SP/LE when I first started. Most of my training was Army related. You'll get screamed at, forced to make quick decisions and stuff....but it's all minor crap. The TI's won't call you names (Big Deal) or hit you. When I went in many moons ago, they could practically kill you without the threat of a congressional investigation. That's all changed.
Good Luck
MSgt Bob (Ret)