4 ms·Or they can move faster or carry more weight. You can warm yourself by moving or by metabolism.by throwaway173738 7mo agoOr they can move faster or carry more weight. You can warm yourself by moving or by metabolism.tantalor 7mo agoIt's mostly from metabolism, friction is negligible (<1%).IAmBroom 7mo ago"We aren't carrying the best gear, so we'll just hurry a bit climbing Everest... and carry heavier packs of food, too."