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Your question ... the way you wrote it ... really doesn't make sense. I think you meant the second choice to be "legs straight and knees locked". That configuration is more likely to hurt you, because your knees can't absorb any of the impact, and the shock is transmitted up into your hips and spine.
bent knees ---- a lap
In tuck, your knees are bent. In pike, your knees should be straight.
Try walking or jumping with your knees locked. Seriously, does this need to be answered?
This is normally because of blood clots, if blood clots are chronic in your family then then that is your problem. it may also cause cramps.
The knees are the joints involved in squatting and squatting exercises. The knees are bent as the body lowers, and extended when you return to the standing position.In a "squat thrust" the body is bent over, knees halfway bent, and the legs are quickly extended outward, unbending the knees and moving the feet away from the body. Then the legs are pulled back in to the starting position.In a "squat press" (typically using light barbells) the knees are bent and then straightened and as the body becomes erect, the arms (holding weights with elbows bent) are used to lift (press) small weights above the head, fully extending the arms.
plié
slighty bent
slighty bent
Please state why your knees hurt? Is it an injury? Is it arthritis? It makes a huge difference, so please rephrase your question.
As long as you keep their head above your knees, it won't hurt them.
If a person has an abdominal wound, you should rest their upper half on your bent knees on the ground.