important to pick one that works for you
Most of the videos out there are going to do some good if you do them on a regular basis. Pick one that fits the theme, type of exercise, and intensity level that works for you. Most important that you like doing it so it will happen more often.
Here is a site with a lot of video options. I can't post the full address because this site is saying I can't do it until I have 15 posts. You'll have to type in the rest of the address:
collagevideo.com