rectus abdominis or the six-pack muscle is the topic of today. I am not only giving you two of the most effective exercises for this muscle, i also tell you how you should do any other ab exercises generally. although fat loss does not happen by doing ab exercises as much as we think, still training core muscles has lots of advantages like more stability, balance, healthy spine, good posture, overall power, less pain during functional day to day like and etc. the big rule for training ab muscle is to not focus on the legs but your pelvis. by the way, for demonstration purposes, I do exercises a little bit fast to save time but make sure you give enough time and effort to the exercise.