“How can I regain flexibility in my back?”

First the reasons why your range of motion in your back is limited must be determined. Some possible options would include massage, yoga, Pilates and instrument assisted soft tissue mobilization technique

Hello,
Without knowing the reason for the loss of flexibility, active rehabilitation, including stretching and exercise can improve flexibility. The intensity of rehabilitation will be dependent on your current condition and should be recommended by your healthcare professional. Hope that helps.

First, figure out your "why." Are you sitting too long? Are you sitting in surfaces that are too soft like recliners and cushy couches? Is your nutrition on point with healthy proteins, a variety of fresh vegetables, healthy fats with omega-3s and friendly fiber sources?

After you corrected any issues from above, move your body. Walk, do yoga, bend and stretch. Use a foam roller. And, most importantly, get adjusted. As a chiropractic kinesiologist, I do muscle testing to determine imbalances and I correct those imbalances with chiropractic adjustments. They are safe, effective, and often give immediate results.

A consistent stretching/mobility routine that focus on all angles of the back.

Create a daily stretching routine that you follow religiously! You could also start a yoga or Pilates class. Let your instructor know you are beginner and what your your goal is for your future.