The best time of day to exercise, according to the creator of the viral 7-minute workout

• Working out can feel like a chore without the right variables nailed down.
• Chris Jordan, an exercise physiologist and the creator of the viral Johnson & Johnson Official 7 Minute workout, told us the best time to schedule your sweat-fest.

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Working out shouldn't feel like a chore, but with dozens of variables to nail down before hitting the gym, it certainly can. Did you remember to eat before your spin class? Did you pack the right shoes in your gym bag? Did you get enough sleep the night before?

One thing you can get right about your workout: the timing.

Some research suggests that it's best to sweat it out early in the morning on an empty stomach to help speed weight loss and boost energy levels; other studies conclude that squeezing in your fitness routine later in the day once your body is naturally warmed up is a better idea.

Chris Jordan, an exercise physiologist and the creator of the viral Johnson & Johnson Official 7 Minute Workout - a fitness routine that combines the benefits of strength training and cardio for a full-body burn - takes a slightly different tack.

"The best time of day to work out is the time you're most likely to work out," Jordan told Business Insider.

Jordan, who's worked as a fitness consultant for the US Air Force in Europe and now serves as the director of exercise physiology at the Johnson & Johnson Human Performance Institute, said that he experimented with various timing windows for his fitness routine before settling on afternoons as the optimal exercise window.

He said that afternoons work the best not only for his schedule - which is jam-packed with work and playing with his 4-year-old - but also for his body, which can feel stiff first thing in the morning.

"What I like about working out in the afternoon is that I'm loose, I'm not typically as tired, and my muscles aren't stiff like they sometimes are in the morning," Jordan said. "Plus, it's a great break and I get so much energy afterwards."

Morning vs. afternoon workouts

If you're more partial to an early-morning workout, however, there's great news for you. Some studies suggest that an early-morning workout on an empty stomach helps speed weight loss and boost energy levels by priming the body for an all-day fat burn. Exercising first thing in the morning may push the body to tap into its fat reserves for fuel instead of simply "burning off" the most recent snack or meal.

Plus, working out early could mean you get more sunlight, which is key to properly setting your body's internal circadian rhythm. In one study, people who basked in bright sunlight within two hours after waking were thinner and better able to manage their weight than those who didn't get any natural light, regardless of what they ate throughout the day.

"There are some pros and cons with whatever time you choose," Jordan said. "Maybe you're a bit sluggish in the morning, but if you choose that time, then at least it's done for the day and you'e not going to skip it when unexpected things come up."

Regardless of which time you prefer, the most important thing about your fitness routine is that you stick with it. Whether that means waking up at the crack of dawn to hit the track or cutting out of the office for an hour or two in the afternoons matters less than how well it jibes with your schedule.

"If you need to plan ahead, plan ahead. Schedule it. The most important thing is to do it on a consistent basis," Jordan said.