Most people will know that sex can be a tiring ol' game. But is it quite as knackering as an hour on the treadmill or 45 minutes on a rowing machine?
Well, this couple certainly think so, because they class their steamy sessions as actual cardio in their weekly workout routines and even pencil in the deed six times a week.
Emily and Ross Cowan say that they've managed to transform themselves into muscle-bound bodybuilders and have noticed a huge difference in their waistlines thanks to their scheduled sex life.
All aspects of their life are on a strict timetable - including their moments of intimacy, as they aim to become the fittest versions of themselves possible by including sex as a cardio workout, six times a week.
After they began dating in June 2016, Emily and Ross have completely transformed their bodies to become stronger and more toned with over 16 workouts per week, giving themselves only one rest day.
Yet their extreme lifestyle means the infatuated couple can only schedule in daytime sessions for their romance - as that's when their energy peaks.
Ross, from Rochester, said: "We have the best sex life because we put 100 percent effort into everything we do. A sex life is extremely important - it could be so easy to get consumed with training and running the business that it could be left out.
"Even though we are building our fitness empire every day, we're incredibly passionate towards each other. We're daytime sex people - leaving anything to the end of the day is a BAD IDEA especially when you're busy.
"When we first got together we were having sex three times a day, then, sadly, the business grew. Now we work early or late so middle of the day is always free.
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"If you get to the end of the day and you're still feeling the love, then you can go twice - a beautiful thing about being super fit!"
Emily said: "Working, living, training and eating with Ross makes the relationship stronger. We motivate each other and it makes me more committed to my fitness levels.
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"We often get referred to as the UK's fittest couple from people we help and the competitions, but we remain humbled by the many incredible athletes and fitness professionals in the UK, all of whom we look up to.
"Physically, there are other couples who are fitter, but we eat, sleep and breathe this industry. We change lives through fitness so we're happy to take the title.
"Day one sees me training legs, then day two is shoulders, chest and triceps, before day three becomes glutes and hamstrings. Day four I rest. Then it's back and biceps, before day six kicks off with glutes and hamstrings, before day seven becomes upper body circuit.
"Ross' routine is more simplified - day one, push, day two, pull, day three, legs and day four, rest. Then repeat."
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Push and pull, got it. But what's he pushing and pulling?
The fitness duo now run their own fitness camp known as Body Transformation Academy, in Chatham, Kent, in the hope of inspiring others.
Ross went on: "After beginning to train as a personal trainer, I met Emily and it was an instant, really good connection. Emily's success at body building inspired me - she weight trains every day, and has HIIT cardio four times a week."
The happy duo's dedication paid off, as they took home silver for Pure Elite World Championships Couples 2017 - an impressive feat for a pair only in their first year of competing.
Emily even managed to snag Pure Elite World Championships Fitness Model 2016 when she initially began competing solo.
Tackling a brutal training and diet regime, the pair are wholly committed to taking their fitness levels to the max.
Their standard training regimes may include only one rest day, but the schedule shifts to become even more intense when they approach competition time.
Emily said: "We are determined to keep improving and our dedication is an impressive feat not everyone can pull off - I have three first place awards at world championship level, and Ross, who started competing only last year, already has one."
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