That thing is going to kill some one. At the very least the hand cranks should be set so both are receiving the energy in the same direction.

Anyone else notice that they don't show any scenes of this thing going around any corners? Probably because steering control is marginal at best.
Fact is that anyone can hit his or her anaerobic threshold on a regular bicycle. You're not going to get a better workout by involving more muscles. Just get some dumbbells if you want to build up your arms.

I agree with Gadgeteer, your legs have the strength to go up hill for a while before you get winded, but by using your arms also you aren't going to be less winded.
For performance you are probably better off using clip peddles so you can pull the pedals up with the leg you aren't pushing down with.
The other thing I didn't see in the video is what happens if you take your hands off the hand pedals and hold the regular bars? It looks like the hand pedals stay linked and would hit you in the face if you pedal.
It doesn't look like it supports gear shifting on the front derailleur either which is expected but another hindrance in performance vs a standard bike.
It isn't a bad concept though as long as you view it in the context of more of a mobile exercise machine and not really as a potential bicycle improvement.

I would expect no extra 'ooomph'. When I'm really putting the power to the pedals I am also using my arms (bracing against the handlebars) to keep my body in alignment with the pedals. I could not do this with my hands so close together, especially on a revolving handlebar.
But I can see this having some potential for those with weaker legs who want to ride along flat ground.

It be a little less stupid if they used the hand power to drive the front wheel independently of the rear wheel, and yes it would need it's own shifting stuff. Ditto Slowburn, when you see video of wheelchair users using hand cranks, the hands move in the same direction as each other, a little like rowing. Also whole body bike thing has been done way better for a long time by these guys: http://rowingbike.com/site/EN/Home/Introduction/

First crash will loose someone a bunch of teeth. And apparently you steer by leaning, because I didn't see the handlebars get used at all. ". Meanwhile, your arms just hang there doing little to nothing." really? I use mine quite a bit. and if I happened to be pedaling then need the brakes in a hurry, I need to stop action, shift to a different grip, (without missing) and work the brakes all in the half second I have before I hit that car door opening before me? Very bad idea. The words "Death Trap" come to mind.

When I'm in the drops in my road bike, especially when I'm pounding, I'm using my arms. When I'm on the tops, I'm supporting my upper body weight with my arms. No drops on the mountain bike, but I still have to support myself. Then there is hopping curbs. And having to go up stairs. And all the other times I have to carry the bike.
There are days after a ride when I'm trying to remember when the h#ll I did all those pushups...
So. Yeah. Depends on the set up.

Well i am just imagining the bike trying to get over a pothole that comes as a surprise on the road !!! The whole contraption will be in the rider's face and if the rider is planing to go for brakes then he is more screwed!

That's crazy.
> your arms just hang there doing little to nothing
I think that can only be supposed by someone who never rides a bike on a road.
> That thing is going to kill some one. I completely agree with this comment. And in case if the bike is used on a road with some cars on it, it can create an accident and thus kill not only the biker, I think.
Hands are for holding handlebars, for always being ready to press the brakes. And hands also do their hard work when you are pushing pedals with big effort (going up a hill, or gaining speed), when you need to jump up a curb, when you go through a uneven relief. And even if you go straight forward on a smooth road, on most bikes some part of your weight rests on your hands (because you lean forward a little to put hands on the handlebars). My bike gives good exercise to my hands.
This bike with special pedals for hands looks completely inconvenient and dangerous. Such crazy machine is suitable only for a fitness hall where you just sit on one place and rotate pedals.

Looks very awkward too use, a opposing dual lever system would be much better and keep the hand to foot ratio the same... ie like a strider exersize machine