i escape

The idea, put forward by Sang-Hoon Lee, is that a couple of tiny balls in the handles will spin, thus "generating" whatever weight the user wants... effectively making the dumbbell heavier. A neat trick, considering the small fact that it's physically impossible. Instead of a plausible and ingenious concept that just needs some funding to become a reality, what we have here are a couple of anti-gravity wands that run on magic.

Weightless dumbbells defy physics with gyroscope junk science [boingboing]