Great news! My first downloadable video class is now in the store! This 30-minute Core Challenge Power Planks video will have your body sweating and your muscles shaking — but wow, what a workout! Planks are great for your core and can help improve your posture and tighten your waistline. And you can do this amazing exercise with no equipment, no weights — nothing but your own muscle power. Check out the video and let me know what you think!