Hey there, I am new to this site too. I ran across this thread and I can relate! I am currently 353lbs I have lost ten pounds in the past 2 weeks because I have joined judo and started eating right! I was kinda skeptical about getting in there myself, but I sat in on a class, decided if I wanted to do it or not, then I talked to the instructor. I asked him if he has ever trained bigger guys and he said absolutly. He was very eager to get me on the mat! Everyone in my dojo is very understanding when it comes to warm ups and I cant hack it yet! I am persistant and excited to do it! I give you all the kudos in the world for standing up and doing something about it! Get in there, learn your martial art and have fun! If they are not understanding and poke fun or give you looks FIND ANOTHER DOJO!!!