I am looking for a martial arts movie I saw in the early 80's on Sunday matinee (TV). A young man wanted to train at a local martial arts school. He attempts to sneak into the school and is caught. As punishment he is forced to train even though they think he isn't capable.
I remember that there was a walk way to the "lunch area" and in that walk way was a pool of water. In the water was a "log" of bamboo tied together. The students had to jump onto the log to get over the pool. This young man was not able to get across, but he kept trying until one day he got better than the others. So the next time the ropes were rigged to break when he touched the "log". He still made it across because he was so light on his feet.
Another aspect of training was carrying something heavy (don't remember what, maybe buckets of water) with knives strapped to the upper arms to prevent the student from lowering their arms.
This is all I can remember. I have tried searching google and imdb with no luck.