Hi Teresa.....yes it is! I still need to bend my knees from time to time as well. What I try to focus on myself and teach to students is to work with control-----and bend those knees if needed. It's more important to move with control and ease then to forcefully throw yourself into this so if the knees need to bend, they need to bend. Deep lumbar flexion with bent knees may be perfect .... then gradually lengthen the legs.