When astronauts come back to earth after extended space missions, they sometimes, at first, can’t walk or perform other physical activities very well. The reason for this is that the weightlessness of space makes it possible for astronauts to push and pull objects without the effort, and their muscles become weak as a result.
In the future, NASA hopes to develop ways to make exercise in space more effective, more efficient, and more pleasant.
Back here on earth, the same prinicple applies to the muscles of sedentary older adults: If you don’t use them, you lose them.
The good news… at any age, almost any older adult – or astronaut – can improve their strength through exercise.
Every time you stand, walk, or pick something up, your muscles work against gravity. With each gravity-defying activity, your bones react by triggering the formation of additional bone mass. The more you lift and the faster you move, and the more often you do both, the stronger your bones and muscles become. If you are active enough for long enough, your cardiovascular system gets a workout as well.
Exercise is a necessity. Get moving!!