We hear all the time that sex is a great workout, but what are the hard facts? How much sex is considered exercise? On a scale from fast asleep to Brangelina, where does the average sexual encounter lie on the calorie-burning scale?
The verdict:
Sex burns a few calories, but frequent friskiness isn't going to replace the gym
You may not be getting quite as good of a workout between the sheets as you think. According to a study conducted by the New England Journal of Medicine, sex lasts six minutes on average and only burns about 21 calories.

Sex before breakfast. Having sex in the morning is a great idea for several reasons. A man's testosterone levels are the highest between 7 and 8 a.m., for one. Also, if you make time for a half-hour morning session, you can roll out of bed and right into your morning workout and you're already warmed up! Now that's something worth setting your alarm for.

Eating for endurance. Incorporating some endurance-boosting foods can also help when trying to kick it up a notch in the sex department. Foods such as figs, oysters, celery, blueberries, peanuts, bananas, garlic and even chocolate have the potential to boost a man's sexual stamina.

Switch it up. With sexercise -- as with any workout -- it's important to try new and different things all the time. By trying more challenging and adventurous positions, you use different muscles for stabilization, constantly surprising your body (and maybe your partner), and getting a better workout.

Core-gasm. Engage your core at all times while having sex. Focusing on your core and isolating the muscles around your pelvic floor will not only strengthen your six-pack, it'll make your tummy look flatter in the moment.
read more http://ajoshpro.com/2017/09/can-sex-be-a-workout/