It turns out that in order for the training to work as efficiently as possible, it should last at least 40 minutes.
If there is a need to burn fat through exercise, you need to remember that the body first uses glycogen reserves, and only then goes to fat stores. It is on this fact that a recommendation is made that a fat burning training should be conducted for at least 40-45 minutes at a moderate pulse.
Fat quickly burns during cardio work in the morning on an empty stomach or during training 3-4 hours after a meal - as the blood glucose level drops to the minimum level, glycogen (and then fat) stores begin to be spent from the first minutes of training, and not energy glucose from the blood. That's the whole secret.
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