Where does back pain come from on the bike? There are a lot of causes but here are the three that I see pretty often.
Problem-Solving Programs:

Solve Saddle Pain
https://bikefitadviser.com/solve-your-saddle-problems/

NEW BIKE? Get the right size:
https://bikefitadviser.com/what-size-road-bike/

SOLVE KNEE PAIN on the Bike:
https://bikefitadviser.com/solve-cycling-knee-pain/

My favorite cycling insoles https://amzn.to/2G3Sv9n

Here's a Playlist on...

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