In Backstroke, Stroke Rate is the Highest Priority The fundamentals of good backstroke technique are not much different than with good freestyle technique.
Swimming Strokes 101: A Beginner's Guide to Different Swimming Techniques - Guide
Swim Training: Rethink Rotation in Backstroke and Freestyle
Mastering the Butterfly: A Step-by-Step Guide
Freestyle Pulling Cycle: Propulsion Phase Back Quadrant
Backstroke Start Technique: A Beginner's Guide
At the Tokyo Olympics, Canada's swim team is taking a deep dive into the data pool - The Globe and Mail
SECRET TIP to Improve Your Freestyle
What is the difference between various freestyle swimming pull techniques? - Quora
How we analyze Freestyle at The Race Club - The Race Club