Originally Posted by supercell

Hi Amjad,

Welcome to uk muscle and to my thread and thanks for your comments.

Cardio is best performed before your first meal as it is the best time to tap into the body's fat stores.

In simple terms, when you sleep you are fasting (ie not eating for 8 hours) and therefore your body is more depleted in stored carbohydrate or energy (muscle and liver glycogen)

Whilst you do your cardio, after about 20 mins the body will switch to using the bodyfat as its primary fuel source instead of the food you have just eaten or muscle glycogen from the carbohydrates eaten and stored many hours ago (the day before).

It also helps in kick starting your metabolic rate, so you not only benefit when you are doing the cardio but also after, as there is quite a time lag until the body returns to its normal metabolic functioning.
This way you can continue burning bodyfat many hours after the cardio has taken place.

Hope this kind of helps

James