The line down your back is just the seperation between the muscles. Th, back workout

The Big Reasons Your Back Isn't Growing

Diastasis Recti Exercises for Men: 7 Best Exercises to Heal It – DMoose

Lower Muscles of Back Anatomy and Low Back Pain

Understanding diastasis recti, Postnatal Exercises

Anatomy of breathing: Process and muscles of respiration

35 Butt-Lifting Exercises - Best Butt-Lifting Workout For Women

The Most Effective Compound Back Exercises [15 Best Variations] - The White Coat Trainer

24 Best Arm Exercises for Building Arm Muscles

Diastasis Recti - What It Is and How to Treat It

10 dangerous exercises that lead to injuries

Diastasis Recti Surgery: Repairing Abdominal Muscles

I'm really interested in getting a defined back line like this photo - does anyone have advice on if Strong Curves can help with this goal? : r/StrongCurves

10 Best Glute Exercises for Men [Build a Great Butt]