Pick an update for the human body

Less mucus, does not address excess mucus problems by creating more mucus

Fevers aren’t dangerous or unpleasant

Less fragile (both soft and hard tissues)

Stronger, faster and more agile

Intentional change (exercise, etc) is much easier to achieve and maintain*

Brain patterns easier to change

Stronger immune system; sickness of any sort is harder to get but still sucks

Base five senses greatly improved

Unpleasantness of physical pain highly reduced, benefits/awareness remain

Add three features from other animals (claws, tail, night vision, venom, etc)

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