Learn how to workout like a Shape Magazine fitness model! diet.com Karena bring Katrina and Sarah through a fat burning interval workout on Manhattan Beach. Before her shoot with Shape Magazine, Karena did this workout to lose weight and tone up! Watch more videos at Diet.com or download this one right to your iPod to watch at the gym for the less a BUCK! Check Out Diet.com Video! Diet.com: www.diet.com Subscribe to Our YouTube Channel – www.youtube.com Go behind the scenes w/ Sarah’s Blog- www.diet.com Twitter twitter.com Facebook: www.new.facebook.com iTunes: tinyurl.com Sarah’s Fitness Blog – www.examiner.com