Sexy Summer Abs Workout Planks, side plank lifts, knee hugs and a whole lot more to get those abs on fire! In between reps on the knee hugs try not to let your feet touch the ground; this will make it even harder and work your lower back as well
Found this on Core Pilates website and I love it. It's a great all around arm workout. 5 Minutes to Toned Arms - a quick, easy workout you can do at home or in the office to get tanktop ready. No gym or equipment necessary!