The launch of Powerade Zero, described as the "first ever zero sugar, calorie-free fitness drink" is backed by a campaign featuring World Heptathlon champion Jessica Ennis.

A 30-second teaser TV ad shows Ennis taking on three boxing enthusiasts in a Powerade sweat session. Consumers are directed to to see the full four-minute version. As well as TV advertising there will be posters near gyms.

Powerade Zero comes in two flavours: berry & tropical and red fruits.

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