@lucaswest_fit: A full abs contraction is a much smaller movement than you probably think. Instead of lifting yourself all the way up by doing a complete sit-up, you can get much more out of your abs with a simple crunch. Focus on bringing your chest as close to your hips as you can, without coming all the way up. Your abs function to flex your spine (to round your back). A sit-up involves a lot of hip flexion, which is not what the abs do. #sixpackworkout #situps #crunches