15 Minutes - Causes the listener to become even more motivated to workout, increased desire to eat healthy, build even greater stamina, and continues to develop traits of the typical jock.  Listen to this file with headphones for best results.  Also, listen at times when you are able to close your eyes and focus completely on the MP3. TIP: It is highly recommended that the listener begin with the Jock MP3 for at least two weeks prior to beginning Jock Level II.