It consists of a variety physical poses.
Lotus | downward facing dog | cobra | child's pose | cat pose | tree | video
pigeon pose | plank | bridge | extended side angle
They also have Sanskrit Names e.g. Lotus=Padmasana, Cobra=Bhujangasana, Child's=Balasana. There are hundreds.
See YogaSpace-ct.com and YogaJournal.com
Some things I've found useful.
Supine spinal twist
10 Yoga Essential Poses
10 Minutes of Yoga to Jumpstart Your Work Day
Yoga For Lower Back Pain Is Awesome (With 7 Poses To Prove It) - Pain Doctor
10 diseases you can curb with yoga - Wellness News
How Yoga Can Wreck Your Body - The New York Times
How Yoga Can Wreck Your Body - NYTimes.com, Jan 2012
Scientific Evidence for the Benefits of Yoga | Cure Talk
Bharadwajasana - Reduce waistline
last updated 10 jan 2019