If you’ve got a bit of time this is a fantastic documentary from Nicholas Pettas.
Nicholas Pettas (born January 23, 1973 in Mykonos) is a Greek-Danish karateka, former heavyweight kick-boxer and actor, who fought out of Team Sprit AE in Tokyo, Japan. Pettas mainly competed in the promotion K-1 between 1998 and 2007, and was the winner of the K-1 Japan Grand Prix 2001.
Here he visit with a number of Sensei to understand the mechanics of Aikido. There is a excellent explanation of the mechanics of Aikido from one of the University Professors (also and Aikido practitioner).
In the end I think Nicholas has a great appreciation of the art, although I think he went a little easy on the Sensei, probably due to the fact that he has such a respect for martial arts.