Tossing caber, so I will find a way to keep fit? (8)

I believe the answer is:

aerobics

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'will find a way to keep fit?' is the definition.
I can't tell whether this defines the answer.

'tossing caber so i' is the wordplay.
'tossing' is an anagram indicator.
'caber'+'so'+'i'='cabersoi'
'cabersoi' anagrammed gives 'AEROBICS'.

Can you help me to learn more?

(Other definitions for aerobics that I've seen before include "Exercise regime" , "Exercise in the gym" , "Form of exercise" , "Physical exercises" , "System of exercises" .)

I've seen this clue in The Telegraph.

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