Joe Rogan talks about being motivated for a workout. He also has a very interesting podcast called The Joe Rogan Experience on YouTube (https://www.youtube.com/user/PowerfulJRE). I would recommend checking it out if you haven't already.
The best thing about this video is that he is just having a conversation with someone here and was mostly just off the top of his head.
A very good motivational video for working out and I believe that this mentality can be used in other area's of life as well!
Check it out: