Being a couch potato six days of the week and deciding to ride a bike, work in the yard, go hiking, and/or have sex on day seven - well it could kill you. A recent USA Today article looked at how bouts of exercise and sex may be riskier to your heart if you're inactive.
The Journal of the American Medical Association examined 14 previous heart studies that suggested irregular physical activity can be a trigger for a heart attack or unexpected death, and infrequent episodes of sexual activity increases risk for just heart attacks.
About 1 million heart attacks and 300,000 cardiac arrests occur in the USA a year.
Researchers found a 3.5 times increased risk of heart attack from episodic physical activity, and sex was associated with a 2.7 times greater risk. They compared the results akin to an older person who does very little exercise, then snow falls and they're out shoveling.