The first step was stretching. The simplest one. A few exercises in the morning, right on the mat at home. 10-15 minutes a day. Without fanaticism. The main thing is regularity. After just a week, I noticed how it became easier to get up, and how my body responded to movement. Then I added yoga classes. This applies not only to the flexibility of the body, but also to the flexibility of thinking. You become more attentive to yourself, to the signals of your body. You learn to breathe correctly, relax, relieve tension.
Posture and joint mobility are also important. Working at the computer, the phone, stress - all this makes us constrained. Flexibility is not only about splits, but also about freedom of movement every day. So that you can easily bend, turn, stretch and not feel restricted. If you also want to become flexible, start small. A few simple exercises in the morning, a little mindfulness and regularity. Everything comes with practice.