@ Eddy-RemOvercoming the shackles of stagnancy and deciding to take the first step toward the drawr approach... I considered doing so in Zero's apology thread, but... na.
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To answer the recently-punched-in-the-face tiger's question:
Physics.
Your drawing can improve a lot, so
train that shit... hard. Also remember to learn the rules of physics. If you don't understand em, check out life's endless supply of examples. Try kicking a ball as naturally as possible and analyze your movements. Check out how different they are from what you illustrated. Again, drawing skills are the core to comprehension.