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Bodies in motion in lively callisthenics came with added energy (9,9)

Ross

I believe the answer is:

celestial mechanics

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'bodies in motion in lively callisthenics came with added energy' is the definition.
I can't judge whether this defines the answer.

'lively callisthenics came with added energy' is the wordplay.
'lively' indicates an anagram (I've seen this in other clues).
'with added' means one lot of letters go next to another.
'energy' becomes 'e' (physics symbol as in E=mc2).
'callisthenics'+'came'+'e'='callisthenicscamee'
'callisthenicscamee' anagrammed gives 'CELESTIAL MECHANICS'.

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