While most forms of marital arts rely solely on katas, forms, and constant repetition , in Brazilian jiu-jitsu most of the stuff we learn and practice must be used with a training partner. Everyday on the mat we come in contact with different people each with their own unique style of doing jiu-jitsu, some providing a great help in our training while some crippling our progression. Over the years there has been a lot of different opinions over what defines a good training partner.