Russian Twists are a great ab exercise that specifically target the obliques. Find out how many reps you should do, what muscles you're working and how to work it into a routine @ FitnessBlender.com. We offer an entire library of FREE full length home workout videos; you'll find workouts for abdominals, lower body, Pilates, cardio, boot camp, plyometric, strength training, stretching, fat burning, tabata, sports specific, injury rehabilitation, and more. All free! Also check out http://www.fitnessblender.com for exercise plans, printable workouts, healthy recipes, and more.