hi, this is my first post.

I was always fond of the idea (i know its silly) to train in other planets with higher gravity than earth. This to increase your natural strength so after living in hostile conditions, coming back to earth’s gravity will be easy. You might discover that you have become much faster and much stronger because you got used to heavier gravity than earth. You might even develop the ability to jump so high that you can fly (least likely).

What do you think?

Well, you could simulate higher gravity by using weights, right here on Earth.

Welcome, Magma.

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Or train in a centrifuge.
A fine idea, except for the problem of getting to and living on these other planets (particularly given the fact that the higher gravity ones are Jupiter and beyond)

And welcome Magma

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Thanks for welcoming me and for your comments.

Unless you come up with some super-fast means of transportation, by the time you got back to Earth, most, if not all of the benefits would be gone. This is especially true when you consider that the only planet in our system that has significantly larger surface gravity than earth is Jupiter, and it doesn't have a suitable surface for you to train upon. You would need to go to another star system to find anything that has both a higher surface gravity and a surface you could safely stand on.

Actually, just as an interesting aside, the gravity experienced in the upper atmosphere of Jupiter is about the same as on Earth.

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That is true. The "surface" is defined as the level of the atmosphere where the average pressure is 1 atm, which is the the actual ground surface on Earth, but not any other planet AFAIK.

You would risk injuries training under higher gee. On the other hand, humans probably could adapt to higher gravity without massive problems. Heavily overweight people get by on earth okay. This suggests that humans could survive on a two gee world, however I'm sure a lot of knees and hips and backs will give out in middle age. Also you no one could afford to gain much weight. Only people who are naturally trim should settle on such a world.

High gravity would be very different from being overweight. When someone's overweight, the extra heft is carried in a particular part of the body. In higher gravity, *every single* part of the body would weigh more: arms, ears, eyelids, feet, the "family jewels". The bodily stress would be significant, and you'd have be very careful; a trip that would bruise your knee in one gee could break it at two.

I could see high-gee training being useful for increasing strength. However, as Saluki said, the benefits would wear off quickly once the person returned to "regular" gravity, let alone zero-gee.

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The idea reminds me of an old scifi series where the heroes are an acrobatic troupe from a high G planet. Think it was a Doc Smith, can't remember the title though.

Yep. People who practice body-building may experience 10 g or more. The bicep-buiding exercize for instance, which consists of lifting a weight by the hand, often deals with 30 g. The whole body couldn´t withstand such strain for long.

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I was thinking if someone eventually got used to the gravity (as we are humans afterall surely we can adapt to new situations?) when sent back to earth that person would feel very light, very fast, ect.. And what if human life forms evolved from mars where the gravity is slightly less than earth and we then sent someone to under earth gravity?

They wouldn't be very comfortable for a while until they adjusted to the increased gravity. They'd probably also have to learn to walk again given that they're natural stride would be off under Earth's gravity.

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What if someone from Earth was sent to Mars wouldn’t the person be relatively stronger, faster than a Human copy born under Mars gravity? And finally if Aliens came to Earth from a Planet with 10x Earth gravity wouldn’t they be significantly stronger, faster because Earth gravity would be relatively easy for them to move in because they were used to 10x gravity..

A human who moved to mars would almost certainly lose muscle mass. But creatures on a low gee planet may not be weak. For the sake of the arguement lets say there is a planet with the same gravity as mars but the same oxygen availability as earth. Although creatures would be adapted to the lower gravity, they may not be weak as their strength will be determined by what helps them reproduce rather than just the planets gravity. For example male gorrillas are much stronger than they need to be to cope with earth's gravity because strong males reproduce more than whimpy ones.

I have no idea what critters from a ten gee planet would be like, but they may not be capable of fast movement at all. Maybe legs would be considered a bad idea on those worlds. Even if they have legs they might not be able to jump long distances on earth simply because they do not understand the concept "jump."

CREATURE WITH SIX ELEPHANT LEGS: How do you humans do that? This thing you call jumping?

HUMAN: You just push hard with all your legs at the same time.

CREATURE WITH SIX ELEPHANT LEGS: At the SAME time! By the Great Zarqon, you humans are crazy! It must come from keeping your brains flopping around inside your superior chest stalk.

Hehe my chest stalk speech orifice is laughing!

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"The bread's hollowed out --- the veggies go on forever --- and --- oh my God! --- it's full of meat!" - Maksutov

Yes, but if you're really fat a fall that might bruise a skinny person's knee could break yours.

If I jumped out of a window and started sprinting, my family jewels and eyelids would pull quite a few gee, if only briefly. For this reason I think family jewels and eyelids would survive a non active life on a two gee planet. However if I jumped out of the window on a two gee planet the effects could be disasterous for my family jewels, not to mention the rest of me. (But just why I would be wearing jewelry when I jump out the window is beyond me.)

Although being fat isn't a perfect approximation of the effect of living on a higher gee world, it does seem the best way to estimate what the human body can handle and adapt to long term.

But the Aliens are adapted to 10x Earth gravity and I don't get it wouldn't an earthling on Mars feel alot more lighter, ect.

Oh yeah. If you were instantly transported to an earth atmosphere dome on mars, it would be really cool. Gravity is only 38% that on earth, so you could jump about 3 times higher. Long jump might be difficult because it could be hard to get traction for you feet because you weigh so much less than normal. I imagine long distance running would be dreamy, but if you tried to sprint you might bounce up in the air. And you could lift three times as much mass over your head, but since your own mass hasn't changed you don't get any advantage when it comes to putting your weight behind something. So you could lift your own body weight over your head, but you might find it hard to control it since the weight weighs as much as you do.

The bad news is if you spend 18 months in zero gee getting to mars, by the time you arrive the gravity there might feel heavy.

(The alien from a 10g planet may be psychologically incapable of jumping because such an act might be suicidal on its planet.)

Since we can only speculate on the physiology and chemistry of extraterrestrials we can't say how their bodies would react to diminished or increased gravitational stress. Our only basis for comparison are species here on earth. As far as humans go, our bodies tend to react rather negatively to diminished gravity. As far as Ronald was saying, yes, an instantaneous transportation to another moon/planet with less mass would result in super human abilities. But you'd still have to worry about inertia as Ronald also stated. And you'd most definately have to worry about changes in body chemistry that lead to bone density loss and muscle atrophy. If you're not careful you'd lose too much bone mass and then you're in risk of breaking bones and your muscles whither away slowly and you get weaker and weaker.

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"The bread's hollowed out --- the veggies go on forever --- and --- oh my God! --- it's full of meat!" - Maksutov