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The gym elliptical machines are really great for both tightening your core and toning your hamstrings and glutes. Use gym elliptical machines for flat abs and a firm butt with help from an experienced fitness professional in this free video clip.

Expert: steve Hess
Filmmaker: Jeffrey Hunter

Series Description: If you want to work out like a professional, you're going to have to focus on qualities like explosiveness and intensity. Get pro workout tips with help from an experienced fitness professional in this free video series.