Carter SmithYou may not be able to count making the bed as exercise, but according to a very Masters of Sex new study, getting a little frisky between those sheets just might count as your daily workout.
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Previously, the real-life Masters and Johnson found that heart rates could spike as high as 180 beats per minute during intercourse (we're guessing that's not your standard missionary). But they didn't figure out how that corresponded to calorie consumption--something a team of researchers from Canada recently investigated. To do so, they didn't creepily watch from behind a two-way mirror as pairs romped on a lab table while hooked up to machines. Instead, they asked participants to wear an arm band called SenseWear and to get busy from the comfort of their own homes. The device recorded measurements such as temperature and electrical conductivity of the skin, which scientists used to calculate total energy expended per 30 minutes of…activity.
See more: 8 Products for Better BrowsWhat was the final tally? Sessions lasted 24.7 minutes on average, and women burned 3.1 calories per minute and 69 calories total (yes, that's the actual number). Men burned 4.2 calories per minute and 101 total. OK, so not exactly Soul Cycle, but the study's authors still conclude that sex is a "moderate intensity" workout that "may potentially be considered a significant exercise." And it's way more fun than any Spin class.