MY humble opinion is: don't.
I hope I am not misinterpreting: juice-only for 21 days?
A diet of juice does not go along well with hard exercise.
Yes there are fasting/hiking programs around here even, and I think it's nuts.
I've tried one "juice week" and it messes with your body and psyche.
I am sure you can solve your water retention otherwise, or combine the juice program with light exercise but I don't think it is wise combining it with "distance cycling". And I believe you are into serious distance.
Just eat healthy stuff.



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