Shake Weights were found to be pretty useless in the past, but BodyVib's weights could change that: they vibrate 2,160 times per minute, which is 10x faster than traditional ones.

A 30 - 50 minute charge is apparently good for 2.5 hours of lifting, and according to the company the 1.2mm amplitude is enough to amp your training by up to 50 per cent. I'm not too sure about those claims, but if you want to test them out yourself, go ahead—they cost from $1,060 to $1,190 for the 1.5kg, 2.8kg and 4.6kg pairs. [ProIdee via OhGizmo]