SPG Korea Seksi. Research shows that most heart attacks occur either during or immediately after high levels of energy such as shoveling snow, sex, or run the buses, and particularly prevalent in men and women middle-aged and older .. Typical cardio and aerobic training is not very little to prevent heart attacks caused by high levels of energy during short periods of time. The heart is a muscle and can be trained like other muscles in our body. Our muscles have both slow twitch and fast twitch fibers. Slow twitch muscle fibers used for recurrent, long-term endurance activities such as walking, jogging, etc. Fast twitch, on the other hand provides us with such explosive power we will use in the Sudan, jumping, or running. Traditional cardio workout overemphasizes the development of slow twitch muscle fibers at the expense of fast twitch fibers. Our body will become very efficient in the long duration, repetitive exercise, and very inefficient to produce short, intense bursts of power. Our heart will be trained to the same level, highly efficient in the long term aerobic activity, leading to a moderate level that is sustainable, but not efficient in a short burst, high intensity or anaerobic activity.