What are cross-training shoes used for?

I mainly lift weights (3-4 days/wk) and run occasionally, so would cross-trainers work best for me rather than, for example, running shoes? I’m asking b/c I’ve had my eye on a nice pair of Nike cross-trainers. Thanks in advance!

What’s the best way to break in new cross training shoes?

I bought a pair of Nike cross trainers online and they just came in today. I figured it wouldn’t be smart for me to wear them right away to exercise class tonight, so what would be the best way to break them in?