I did a 21 minute workout of jump rope (with an actual rope - whatdayaknow? it's harder with a real rope!), jumping jacks and walking to recover.
Kelly, I'm sorry you have nausea, and I hope you manage to keep up your activity like you want to until it fades. Is walking rather than running an option?
Amie - you know you're welcome here in whatever form works for you. You're always inspiring (Miss P90X!), busy or not-so-busy.