Achieving Weightlessness

Burying the lede, the suddenly svelte Matt Yglesias reports:'s really just a coincidence but I looked it up and it turns out that I personally am one of Washington, DC's no-longer-obese people, having dropped from 250 pounds (BMI 33.9 "obese") on March 1 down to 211 pounds (BMI 28.6, merely "overweight") as of this morning and I'm hoping to make further progress

This is awesome, and I know this on some deep level. One of the problems with losing weight is that there is a lot of money to be made by convincing people that it's easy, results be damned. In fact, it's one the hardest thing I've ever done in my life. But you can't sell those weight-loss shakes that way.

In that vein, a plea for help for those who are fitter than me. I've got a nice gym routine going--some cardio and some weights, and a couple days a week in Central Park jogging. The problem is that I'm going away for a good six weeks to a place where I won't have weights accessible. I'm going to be running a lot, but I don't want to come back a total weakling. Any suggestions for maintaining all around body strength. I'm thinking pushups, crunches and weightless squats. After that, I'm kinda lost. I don't think I'll have a pull-up bar or anywhere to do dips.