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They say that a brisk walk a few times a week can do wonders for your body.

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Maybe you've tried to boost the cardio factor by turning your walks into runs.

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With some work, you'd be able to build up some serious endurance.

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But what if you ran for an entire day?

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Let's do it!

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Hour 1. Your body will immediately start using the

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molecules we get from food for energy.

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Within the first 30 minutes, you'll start burning any "bad" fat, since your body

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uses this and glucose from food for additional energy.

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While glucose is getting absorbed by your body, you'll really start to "feel the

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burn" in your muscles.

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Your heart will be pumping hard to send blood to your muscles in an attempt to ease that

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burn.

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By the end of the hour, you'll have boosted your metabolism so much that it'll be higher

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for a day or so, and you'll have burned some fat!

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Some of the immediate effects would be: bursts of energy as the body continues to convert

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calories into energy, elevated mood as the brain releases "happy" chemicals, and

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improved attention span.

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Hour 3. The amount of exercise recommended for the

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average person is two and a half hours a week.

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So, if you're running for 3 hours, you're probably training for a marathon.

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An extremely fit person could complete a marathon in 3 hours (which is about 26 miles.)

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If you run for 3 hours a day, you could be risking a sports injury; but your heart will

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be much healthier, you'll lose weight, your skin will look improved, and you'll have

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much more stamina throughout the day.

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Hour 5. It's possible…but at this point, you would

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encounter some detrimental effects after running this long without experience.

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Your joints, especially your knees, will be in pain.

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But if you're training for a marathon, running 5 hours a day is a reasonable goal!

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A "fitness runner" could definitely finish a marathon in 5 hours.

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You'll see muscle tone and weight loss if you're running 5 hours a day on a regular

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basis, and you'll feel happier and less stressed.

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Just make sure you're maintaining a diet that's sufficient for this intense type

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of exercise!

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Hour 8. This might be nearly impossible to do if you're

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not an experienced runner.

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Let's assume that you're not.

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If you ran or worked out for 8 hours a day, you would so-to-speak "hit the wall" if

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you aren't getting enough calories and protein from your diet.

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You would probably stop feeling those "happy chemicals," resulting in burnout, and experience

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severe muscle cramps.

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Even in marathon runners, recent research has shown damage to the right ventricle of

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the heart, due to heart enlargement.

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Here's the kicker, though: doctors found that the heart was healing itself from this

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damage just a week later.

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Hour 10. Unless you've been an experienced marathon

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runner for years, running 10 hours at a time is definitely excessive.

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If a non-runner just took off willy-nilly, we probably wouldn't have enough endurance

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or muscle mass built up—we'd be very prone to injury.

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At this point, anyone would really need to stop to replenish calories, or risk the body

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breaking down.

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Now, if you're a cross- county runner and you run a long distance while purposely keeping

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a slow pace, that's different.

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It gives an experienced runner a chance to fine-tune their form and work on their controlled

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breathing.

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Hour 12. Hopefully you're carrying a piece of fruit

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or a granola bar with you to replenish some calories and glucose!

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At this point, your lactic acid might be out of whack too; your muscles produce this when

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you're doing an intense workout.

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Abnormal lactic acid amounts in your body can cause an imbalance in your pH levels,

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which tell you how acidic your blood is.

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Too much acid in the blood can cause serious problems, including cardiovascular issues.

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Too much lactic acid can give you really painful, sore muscles, or even cramps.

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Hour 15. Only experienced runners in tip-top shape

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should attempt to run for 15 hours.

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Let's start looking at some negative effects that excessive running can have on the body.

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A 15 hour run can seriously damage the cardiovascular and skeletal systems.

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Plus, the body has to "burn" sugar, calories, and fat for energy, right?

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When we burn all of our energy too quickly, it can cause plaque buildup in our arteries,

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and something called oxidative stress; this is essentially damage to your body's cells.

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Hour 20. Your feet, pro-runner or not, would be in

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some serious pain right now.

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There are both a mental and emotional aspect to this kind of endurance.

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After a long race, experienced runners often feel a wide range of emotions: pure exhaustion

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down to the soul, tears, happiness, a break in the iron-clad willpower, or a tangled-up

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mix of emotions.

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There are so many chemicals firing in the brain while running, that the emotional end

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result isn't surprising.

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You might also be crying because it feels like your legs, calves, and feet are on fire!

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Hour 24. There's actually a special run held in Austria

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that lasts 24 hours, known as the "ultra marathon."

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Participants see how far they can run in a 24-hour period.

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So humans are able to run for 24 hours, but the damage may outweigh the reward.

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If you run for 24 hours, all the benefits of a normal running session—increased bone

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density, muscle tone, increased lung capacity and endurance, elevated mood—will likely

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disappear.

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Not to mention the recovery time you'd need for your muscles, joints, and cell damage.

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You would need a lot of sleep and time to replenish calories.

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Now, between you and me, and 30 million other subscribers, what's the longest you've

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ever run?

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Humans were built to run from an evolutionary standpoint (think of our ancestors chasing

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after their food), but that doesn't mean that excessive running is healthy.

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There's no doubt that it's a good form of exercise, but moderation is the key!

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A good diet is important to support your body for exercise, and everyone's fitness picture

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will look different.

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Your age, fitness level, weight, and pre-existing conditions should be taken into consideration

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when coming up with a workout routine.

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Considering all that, we humans have made some major achievements in running.

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There's one recorded incident of a man outrunning horses.

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In another instance, a 61-year-old potato farmer ran for 5 days straight.

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That's what we call a Spud Stud!

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French runner Serge Girard set a Guinness World Record in 2010 by running 16,784 miles

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in 365 days.

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In 2015, Camille Herron set a world record by running 50 miles in about 5 and a half

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hours.

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Xu Zhenjun ran the Beijing International Marathon in 3 hours and 43 minutes—backwards!

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Keep in mind, only very experienced runners that are in optimum shape can run in extreme

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intervals of time like these (such as an Olympian or marathon runner).

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Running requires a lot of practice, in that it has a proper form and breathing technique.

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Never set a fitness goal or start a workout routine without consulting your doctor.

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As long as we train carefully and safely, there's really no limit to what humans can

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achieve in the running world!

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As they say "If you really want to know someone, run 24 hours in their shoes".

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Then when you're done, you're 24 hours away, and you can keep his shoes….

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Okay I'm kidding.

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Hey, if you learned something new today, give this video a like and share it with a friend!

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And here are some other videos I think you'll enjoy; just click to the left or right and

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stay on the Bright Side of life!