Anyone out here travel in an 18 wheeler?

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Hubby drives and I am constantly out on the road with him. I've hit my first goals (from 220 to 198 size 22 to size 12) just by eating right,managing my caloric intake and starting to run and do a bit of ab work every day. Now I need to figure out how to keep everything tight and toned while on the road. I'm not looking to bulk up but i am looking to tighten and tone so that hopefully I don't ever have to go under the knife to deal with loose skin. Anyone have any advice?