Go for the flow.
Many know the relaxation technique of tensing the body’s muscles, head to toe, and releasing them, in a wavelike sequence.
It is a great relaxation technique, yet it is also a superb warming-mobility approach as well. As you well may know, static stretching of muscles without warming up, is now out.
Tensing muscles even more in their tighter states of unreadiness (i.e. when you feel tension binding your body, movement, and coordination), will bring the warming blood flow increase to the targeted muscle or muscle group. Relaxing then, the muscles loosen. Progressively, tensing again, and releasing tension again, brings yet more looseness and pliability to the muscles.
A good example to illustrate is that of leaning over to touch our toes, and stopping at the point of felt-tightness, hanging there a few moments. Feet are flat on the ground. From the ground, from feet through the lower back, including all hip girdle muscles, we tense all of our muscles that we can and hold that tension a few seconds. Then we release. We should then feel our fingertips and entire upper body descend more easily from the waist toward the ground, feeling a bit looser. Repeat the process and see how low you can go.
Remember to breathe, either exhaling or inhaling during tension and the opposite during release, and keep that going. Shake out your body when done.
If you feel dizzy doing this, touch or grab a fixture for balance and slowly recover the upright position. An alternative is to touch the ground, and if loose enough to sit down, sit down and rest until the dizziness is over. If the dizziness is major, you feel you are going to faint or blackout, or if you repeatedly get dizzy doing this, stop exercise and schedule a physical with your doctor and tell your doctor about your experience.
Otherwise, think of the many formerly static stretches you used to do by warming up more generally, and add this specific and gradual tensing, releasing, extending, and repeating process to build flexibility, pliability, utility, and strength in the many, many supporting and dynamic muscles of the body.