Could humans live on a planet with more gravity?

I have been hearing alot about the Gliese system and they are talking about humans living there some day in the very distant future, but they also say these planets are about 6-8 times the size of earth. They are most likely more massive then, causing stronger gravity, 6 times the gravity here! That would mean that if I weighed 100 pounds here, I would way 600-800 there! Is there something I'm missing, don't we need earth like gravity, or less to survive? It seems that with that strong of gravity our blood would be slowly pulled from our upper body and into our legs. Thanks!

Sorry if my typing is weird this is on my IPhone and I have autocorrect off lol.

That (increased weight) will make moving difficult, indeed. Further, some significant adaptation might be possible especially if there's a way to experience part of this change over a long time. Six months on the ISS leaves astronauts with measurable atrophy of their muscles and skeletons.

It would be difficult and dangerous to live at twice Earth's gravity, but I suppose a very few athletes could survive 3 or 4 times Earth's gravity, but it would likely be a short life. Neil

No, unless these humans are products of eugenics that is specifically directed towards gravity 2-5 times that of Earth's.

For example, the blood that rushes through your body would also be weighed twice as much. However, your heart would in no way be able to pump that blood through your entire body. It would be too weak. Another example of this would be the pressure on your spinal column. A body that is not use to such tension would have its cord eventually snapped along with many other bones.

It would not be in your best interest to live somewhere with twice as much gravity as Earth, and if you were to go to the a planet with 6-8 times the size of Earth, then there's pretty much absolutely no hope for your survival.

The surface gravity may not be so high. Uranus and Neptune are about that mass and have mantles of water ammonia ice yet the surface gravity of Uranus is 0.89 g. If the Gliese system is a water world, it may have a surface gravity similar to Earth's despite being more massive. Six times the mass does not mean six times the surface gravity as the radius of the planet would also be larger.