Wanting to poop when you tiptoe may be caused by increased blood circulation and contraction of the muscles around the anus.
Tiptoeing is also a kind of exercise, which can promote blood circulation and accelerate blood flow throughout the body over time. Intestinal mucosa will be accelerated because of the acceleration of blood circulation, and cause intestinal peristalsis accelerated, leading to intestinal contents downward excretion accelerated, thus causing the urge to poop.
Tiptoe, calf muscles, thigh muscles, buttocks muscle contraction taut force, resulting in the muscles around the anus will also involuntarily contraction force, to promote the blood flow around the anus, play a role in promoting defecation, caused by the intention to poop. Over time, it is easy to form a conditioned reflex to help defecate and relieve constipation.
Tiptoe movement should be moderate, to avoid causing muscle strain.