Beat goes on for evergreen boyband

BRITNEY Spears might need a backing track to "aid" her in concert but Grasshopper will have none of that. The members of the evergreen Cantopop boyband reveal in an email interview that they rely on strict exercise regimes and diets to keep themselves in shape so they can still wow fans in their typically high-energy shows three decades in.

Known for their flamboyant costumes and showmanship, Grasshopper's "live" performances are non-stop two-hou…