Is it OK for kids to weight-train? Also, can exercise help reduce “man breasts?” Smart Fitness answers your queries. Have an exercise question? Send it to smartfitness@msnbc.com. We’ll post select ...

When you think of weightlifting, a lot of us have this image in our mind of guys with big muscles pumping iron, b ut it's not just a grown man or woman's thing anymore. Something you've always heard ...