It takes time to learn how to balance yourself and launch a run... learn how to use your pecs, lumbar and hips when relaunching a run.
First try to stand properly, lean forward and try the default method of running like extending one hip contracting another, rotating lumbar, holding chest and moving your pecs...
Also, try to rotate your upper body part in the opposite direction of your lower body part to land properly when you take a step... pecs and lumbar help alot for thi purpose