Geek or not, if there’s one thing we all have plenty of it’s Cds. And if you want some exercise, but don’t happen to have any dumbbells around, just create your own with all of those CDs collecting dust. The one pictured is 10lbs. All you need are 150 CDs, a threaded rod and bolts and you’ve got a 10 pound weight. The rest is up to you my flabby friend. This should give you an idea of what mailmen had to go through back when all those AOL CDs were arriving at your house. Sure some got all muscular, but others threw out their backs.

The dumbbell hasn’t had an upgrade in a long time, if ever. Well, now suddenly they are getting smarter. What if you could have an entire set of dumbbells in one compact design? That’s the idea behind this concept by Sang-Hoon Lee.

You can digitally adjust the weight of the dumbbell. There are tiny balls inside the dumbbell that spin. The faster the balls spin, the heavier they weigh, thereby beefing you up so you don’t look like a girly man. You can adjust the speed of the balls, which adjusts the weight, simply with a dial and pushing buttons. The set comes with a charger cradle..