What are “cross-training” atheltic shoes really designed for?

I need to replace my old "walking" athletic shoes and would like to get into jogging and running. But, I don’t want to buy two pairs of athletic shoes. Are cross-training shoes going to fit the bill?

What is the difference between a fitness and bike and a road bike?

I am a regular mountain biker, but like to road-ride, too. However, my full-suspension is way too much drama for the pavement and even my hardtail is too heavy for efficient road travel. I want something lighter and better suited. The problem is, I am not super fond of the "feel" of road bikes. I saw that Trek (my fave) had "fitness" bikes and "urban" bikes and I am wondering if anyone can tell me what are the advantages/disadvantages to choosing a fitness or urban bike over a road bike?

THANKS!
Just to add, a fitness bike is not a stationary bike. It is an actual style of bicycle like urban, road, mountain, triathalon, etc. I was just hoping that someone had some info on what might be better suited for me. Thanks to anyone who can help!

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