Gesture drawing is a geat warm-up, and it is a way to create dynamic poses.
Find reference photos of people in action or in dynamic poses.
Make lots of quick sketches based on the reference images. Try to exaggerate the poses.
It is not about anatomical correctness, but noting down dynamic poses.
Don’t spend a lot of time on each. Instead, do many.
Consider the movement inside the body (the “line of action”) and exaggerate it.
See how the chest/hip contorts, and exaggerate that also.
Make sure the head and feet are positioned such that the model would not topple in real life.
Also note the relative positions of the hands, elbows, knees, and feet. It helps you construct the pose correctly.