Russian term
United Kingdom
быть в тонусе
Thanks!
Jul 3, 2009 13:47: Vladimir Dubisskiy changed "Field (specific)" from "General / Conversation / Greetings / Letters" to "Idioms / Maxims / Sayings"
Jul 3, 2009 20:52: Judith Hehir changed "Level" from "Non-PRO" to "PRO"
PRO (3): Vladimir Dubisskiy, Vitali Stanisheuski, Judith Hehir
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Proposed translations
Be/Stay on your game/toes
to be full of vitality (or full of vigour)
United States
UNSURPASSABLE EXPERIENCE
Native in: Russian 
, Ukrainian
Works in: English to Russian, Russian to English, Ukrainian to English, and 3 more.
to be tuned (or to be in tune with)
(somehow i believe it's a kind of a back-translation here)
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Note added at 1 hr (2009-07-03 14:09:46 GMT)
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that's what i thought..
in tune with (politics, political trends)
Belarus
No-nonsense approach
Native in: Belarusian 
, Russian (Variant: Standard-Russia)
Works in: English to Russian, English to Belarusian, German to Russian, and 6 more.
to feel / keep fit
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Note added at 1 гадзіна (2009-07-03 14:11:07 GMT)
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Then, after the context has been provided: keep alert.
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Note added at 1 гадзіна (2009-07-03 14:18:16 GMT)
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But maybe, "be fit" can also work here. As I understand the phrase, "быть в тонусе" means here "to be ready for dynamic actions, say, to defeat some attack"...
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Note added at 1 гадзіна (2009-07-03 14:33:49 GMT)
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Synonyms for "alert" here: watchful, vigilant.
to be with it
Otherwise: to be toned, to be in (good) shape
Russian Federation
proficient translation
Native in: English , Russian
Works in: Russian to English, English to Russian, English
Better than native
Native in: Russian
Works in: English to Russian, Russian to English, German to Russian
stay on top of things
Bulgaria
respect to language
Native in: Bulgarian
Works in: English to Bulgarian, Bulgarian to English, Russian to English, and 3 more.
Discussion