Sensei's test were always crucial and for me stressful. He was very strict and often times students will fail if they did not perform wazas with perfection. Heart thumping, butterflies turning, sweat pouring = ME. Here is a clip I filmed while waiting for my turn to test. Notice how Sensei would not move from sitting saezar - he would sit like that for HOURS without moving once to shake his legs! After testing he would stand and shake his legs and walk so slowly until he got his blood flowing through his legs again.