Have fitness questions? Fitz has your answer. Our ThatsFit.com fitness expert -- and now your own virtual personal trainer -- will help you get fit, increase your overall health and do it in a fun way. Drop your questions here in the Comments section below and we'll choose two per week to publish on That's Fit! Learn more about Fitz here.

Q. Dear Fitz, I know that most people are trying to lose weight, but I am trying to gain. Gain muscle, that is. I am going to the gym three to four times per week. I'm using the weight machines there, but It doesn't seem like I am gaining any muscle. Could you give me some advice? What types of healthy food should I eat? Should I be doing more reps with less weight or fewer reps with more weight? Any help would be appreciated. Thanks, Lea Rettig

A. Hey Lea, your question is superb, and the answer thank goodness is quite simple. Strength training should be challenging. Funny enough, my clients always seemed shocked and follow up that feeling of shock by giving me dirty looks when I pass them the dumbbell I'd like them to lift. Along with that dirty look, I receive chronic cries of, "Fitz! That's heavy!" Well, yes. Yes it is. The purpose of strength training is to get stronger, and yes ... build muscle. If I were to give them weights they could already lift comfortably ... they wouldn't be getting any stronger!

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