The term Lucy comes from the song by the Beatles Lucy in the Sky with Diamonds which is commonly thought to be about LSD. Lucy is often used as a code word for LSD when referring to the drug in a public setting or over the phone where one does not want to openly discuss illegal activities. Lucy is used like a person's name in such discussions. Like saying Lucy took me on a trip last night to indicate you tripped on LSD the previous night. I tripped balls with Lucy last weekend!
The capacity of your body to store muscle and liver glycogen, however, is limited to approximately 1,800 to 2,000 calories worth of energy, or enough fuel for 90 to 120 minutes of continuous, vigorous activity.
The harder you exercise, the more energy you use per minute, and the greater the proportion derived from carbohydrate. Very vigorous exercise predominantly uses carbohydrate (muscle glycogen), but this does not mean that it is not effective when trying to reduce your fat stores.ogging for 30 minutes will use more energy than walking for 30 minutes, the primary reason being because you will travel a greater distance in 30 minutes of jogging than in 30 minutes of walking. Exercise intensity also influences the proportion of energy that you get from fat and carbohydrate.