take 20 seconds every morning to warm up your glutes:
Do a number of slow, wide leg rolls, one way, then the other. Increase this number gradually over the days, without overdoing it but improving the amplitude.
☞ Every morning, perform about twenty pinwheels backwards, looking closely at the ceiling. Slowly, without forcing, stretching your arms well.
☞ Stretch arms and legs for... as long as possible, 3-4 times/week. Make sure your back is straight and aligned . In the beginning, it would be good if someone controls it for you.
☞ Do ten to twenty windmills every morning, slow and wide with your arms, in one direction, then, after a break, in the other. As the days go by, improve the amplitude.