It Burns tons of calories. It gets your heart pumping and you’ll likely break a sweat.  It’s everyone’s favorite workout that doesn’t feel like a workout. But should sex count as a workout?

A 2013 study published in the journal PLOS One answered that question by asking 21 heterosexual couples to complete a 30-minute endurance test on a treadmill at moderate intensity. Then, they were sent home with some sexy activity-monitoring armbands to do the deed at least once a week for a month. They were asked to note how each sex act made them feel “physically and psychologically, especially compared with running on the treadmill,” the New York Times reported.

The researchers found that sexual activity burned around four calories per minute for men and three per minute for women. The results rank sex at about the equivalent of walking uphill or playing tennis, according to the Times. Of course, like with any workout, the more vigorously you go at it, the more calories you burn. Not to mention there are a wealth of other ways

Our take? Sex does a body good, including strengthening the immune system, boosting heart health and banishing stress, but you probably shouldn’t quit regular exercise.

“Sex and exercise should both be incorporated into your routine on a regular basis. Studies show that each improves health, so the combination of the two leads to a greater quality of life.” study author Antony D. Karelis told Men’s Journal.