low impact cardio workouts.

I'm making my boyfriend a low impact cardio workout to get back into exercising again. He specifically just wants to do low impact cardio between 20-30 minutes long. Trying to get 20 workout videos to make a routine for him to input on the calendar.

Obviously I've already got some ready to go but just wondered if you guys have any faves that I can have a look at and add too.

Thanks guys :)