The bottom line is that you should train both Gi and No Gi--if you can. There are advantages and disadvantages that come with each style, and each will make you a better grappler. For the most part, you shouldn’t commit yourself entirely to one style vs. the other, and the people who do this are only limiting their growth (more on this later).
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How to find a BJJ gym in your local area
The 15 questions to ask before signing up for a BJJ gym
Signing a contract at your BJJ gym
What gear you need to get started in BJJ
What to know before your first BJJ class
What to expect the day after your first BJJ class
How BJJ will affect your personal life