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How you walk is important for which muscles in your body are working and for overall energy efficiency.  Walking heel to toe is, for humans, the most efficient way. It takes nearly twice as much energy to walk on your toes than it does to land on your heel. In addition to that, if you walk in the toes-to-heels way, then you’re reducing the amount your Achilles tendon stretches, and your soleus muscles (under the knee to the heel) don’t work as much.