Leg stretchers, good or bad?

[RabidMAT12]

Hi i was wondering if getting a legstretcher would be a good idea. I think that just spreading my legs as far as they will go then trying to place my head on the floor is bad for my knees.
Grateful for any help thanks.

[Manufest]

leg stretcher is nice but not necessary, if anything you're more likely to injure urself with the machine rather then doing it by yourself.