My pants for karate class won't stay on?

judofox2008

New member
My pants keep are always coming off when I kick in class, what can I do so they don't fall off one day and I'm not naked infront of the class?

Also, is there a good video out there that shows how to tie the obi? When I tie my obi i find the center of the belt and wrap it around my body. But it criss crosses at the back, is this normal?
 
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