This is the 10664th most frequent Swedish word.
krävas
"To be required"
Here, 'krävas' is used in an impersonal construction indicating that certain conditions must be met to achieve a goal.
För att lyckas krävs hårt arbete och engagemang.
To succeed, hard work and dedication are required.
In this sentence, 'kräva' is used in its active form to express the direct need or demand that training imposes.
Träningen kräver mycket energi och tid.
Training demands a lot of energy and time.
Here, 'kräver' is in its active form, highlighting the role of the subject in actively seeking or insisting on certain help.