The action of straightening the knee occurs in standing poses such as tadasana, vrksasana, and uttanasana, and in floor poses such as dandasana and paschimottanasana.
This 1-minute, 35-second video shows the basic knee alignment of tadasana. After purchasing the video, click on the YouTube icon to view it on YouTube. Save the URL in the address bar for permanent access to the video. Although the video may be viewed on a mobile device, the URL can only be found on a laptop or other personal computer.