Subscribe Now: www.youtube.com/subscription_center?add_user=ehowfitness Watch More: www.youtube.com/ehowfitness 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.