The Ultimate Exercise Library for Busy Professionals Simple, effective movements to burn fat, build strength and stay consistent Download Your Free 7-Day Beginner Strength Plan Today!!! FREE 7-Day Beginner Strength Plan Skip to Videos Strength Training For Beginners | Abs | Chest | Back | Biceps | Triceps | Legs | Shoulders | Abs, Knee Raises Knee raises is a fantastic exercise for adding core strength in the lower abdominals. Also great for posture and working the hip flexors.