I am 17 and I do Karate. My knee keeps buckling whenever I am in horse stance, or doing a front thrust kick. It is almost like it's going backwards. My instructors ask us to go as low and wide as we can in our stance. They want me to exaggerate distance. We do single, triple and punches in threes while in horse stance, and that is when it usually buckles. My feet are always pointed forward, I try not to lean. We do this for a good minute, maybe a little less. I am 90% sure that weight is distributed correctly. I started stretching every other day and running backwards as well doing wall squats, also just stretching more before practicing at the dojo.
Should I wrap my knee and wear a knee brace while I do karate?