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I don't know if there is any really "good" way to carry while working out, but you might look at some of the camelbak packs. Many hydration packs have small compartments in which you could easily hide one of the many pocket pistols on the market today. It would not look weird or stand out in the gym. The drawback is a slow draw and if you are on your back doing bench exercises, you would need to slip it off. Small compromise though if you have safety concerns. I run about 40 miles per week and generally carry a hydration pack with a pistol stashed in it. Works pretty well without looking strange and depending on what kind of exercises you are doing, they don't flop around like a fanny pack can. Plus you can take a drink from your holster!