no gym, no equipment for 2-3 weeks. suggestions to keep my muscle and gain??

As the title says! I will move and have basically nothing for about 2-3 weeks, I have workout DVDs and like running. I can do "real" push ups which I will be doing, what else will help me keep my muscle? Body weight squats, push ups and.... I hate losing muscle and it happens far too easily for me :/

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