Why does the liquid I am blending gets warm?

Why does the liquid I am blending gets warm? I put in almost all cold or room temperature ingredients; oat milk, frozen leafy greens, protein powder, chia seeds.
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bert [Entry]

The blade causes the water molecules to vibrate at a high rate which generates a lot of intermolecular friction between them. When this happens there’s an increase in the particle’s internal energy and this is felt as heat.