Loved doing this massive Q&A!  What I did was take the time to more fully answer questions that I had first addressed in 140 characters on my first Twitter AMA (Ask Me Anything).  Follow me on Twitter where I'm @stephankesting so you can get in on the next Q&A session!  Here's what I talked about...    My cryotherapy experiment update - 01:13 The 3 most essential submissions (and why) - 07:09 Grappling dummies and should you use them - 09:59 Bad hygiene and etiquette on the mats - 13:23 Are there techniques big guys should avoid - 16:15 Should you do a takedown or pull guard? - 18:00 Essential training for beginners - 19:51 Gracie combatives - 24:15 Worst handicap I've seen someone overcome in training - 26:33 Making starting out in jiu-jitsu easier - 27:48 Red flags and problem people at gyms - 29:06 Should belt promotions cost money? - 30:11 Dealing with strong closed guards - 31:20 The types of guard for punch defense - 32:22 Easing pressure on the spine during guillotine submissions - 33:20 Are new rules hurting BJJ? - 34:49 Game changing concepts - 37:14 How to finish single leg takedowns - 38:57 Squats and deadlifts - 40:55 Eating before training; what and how long? - 42:16 Making the most of limited rolling time - 43:04 Best BJJ techniques for self defence - 44:19 BJJ and firefighting - 45:31 Toe holds vs heel hooks - 47:18 Opinions on cross-training - 49:00 Training at different schools - 50:31