Help needed staying motivated!!

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I'm looking for friends and/or suggestions to stay motivated when it comes to working out, especially now that school has started and college doesn't leave much room for working out? I have the P90X program and did the first two DVD's and LOVED them! BUT...I work out and do the entire DVD and then I get so sore for days after and can't find the motivation I need to go back to trying out the DVD's. Anyone have any suggestions?