The video exercise library shows straight knees and even says

whereas House of the Valkyrie Day 38 shows bent knees.
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...The image is correct! our video library is seriously outdated now - it's been filmed over 13 years ago. Some exercises there are mislabeled/have been retired. The reverse plank kicks are now done as the image illustrated so we need a new video for it now.

We were supposed to re-film everything last summer but we ran out of time. So, it's scheduled for this summer now :happy: We'll have a new library... eventually :onfire: