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Mowgli How long would it take a noob to learn and be efficient in BJJ or Muay Thai? Jon Jones learned Muay Thai in a year...is that realistic?
Ok there are some things you have to take into account and some things you have to concede to
There are people in this world that are genetically gifted. They have been in shape most of their lives. These people can become highly proficient in any martial art very quickly because of their natural gifts. There are people that are flabbyn sick that also just have a mind for fight psychology and end up becoming very good. So realize, there is a difference between you, and Jon Jones.
That said, everyone learns at their own pace. Can you become good in muay thai in a year. Yea sure. What are the factors. Age, current level of fitness and dedication. If you train 6 days a week for a year, you will be Awesome. Most people who balance work and family life can only give so much time to the arts so while you can become good taking a class 3-5 times a week, some people get frustrated because noobs with money come in and take night and day classes, surpass them and then crush them.
You wont be officially efficient until you get your purple belt in bjj . Everything before that is a lot of strength, bad technique and tapping. I mean, you dont want to even say you're great at this point because just when you think you're good you'll realize theres someone better. THERE IS ALWAYS SOMEONE BETTER.
In conclusion, can you get efficient in a year? Moderately if you dedicate your life to it but what are the chances? Slim because you may not have the time and or you may not have the genetic gifts but obviously hard work and training does pay off.