For stretching and strengthening the entire body, the inverted triangle pose yoga https://www.julianalucky.com/ is suitable. In this pose, the legs, muscles around the knee, ankles, hips, groin muscles, hamstrings, calves, shoulders, chest, and spine are all well stretched at the same time.
While this is a position that toddlers may need to correct or assist with, they will find it easier and easier to stretch properly as they practice.
How to do?
Get into downward facing dog pose. Alternately raise the right and left hand with the turn of the torso in the direction of the hand and stretch up as much as possible.