First, learn some great self assessments to detect any range of motion differences. Next, practice some positional isometric exercises, designed to activate weak muscles, particularly ones that are sitting in the front of the body that flex the spine.
From here, we will use a mini ball and thigh band (link below) to integrate these exercises with stronger positions with a mindful approach. Listen to the cues and modifications to progress resistance challenges. Over time see your stiffness resolving as you become stronger and more stable!
Purchase the equipment used in this video from Amazon:
Small Pilates Sponge Ball: https://amzn.to/3jaRsE9
Fabric Resistance Band for Legs: https://amzn.to/2WuhPLF
Round Exercise Band: https://amzn.to/32Dvggr
Yoga Mat: https://amzn.to/2ZDSMrH