Only some of them. Most (at least judging from the general level of comments here in Slashdot) are Gammas, Deltas and Epsilons.

Perhaps GMail is glad it's a Beta, because Alphas work too hard?

I concur that aerobic training is the way to go if you are looking to lose some weight. If you absolutely must do it in the privacy of your home, then either a little investment is in order (a stationary bike, a treadmill) or you can try not to think of the preteen girl connotations and skip rope. It's an excellent cardio and coordination exercise, an essential part of the training of boxers and weightlifters, and quite exhilarating once you get the hang of it.