William Henry Bill Cosby, Jr. (born July 12, 1937) is an American stand-up comedian, actor, and author. Cosby's start in stand-up comedy began at the hungry i in San Francisco, and was followed by his landing a starring role in the 1960s television show I Spy. He was also a regular on the children's television series The Electric Company during the show's first two seasons.
4. Reverse Crunch: With this exercise you can strengthen your lower abdominal muscles. As everyone knows, working on lower abs is the most difficult part of any workout session. So, perform reverse crunches properly and tone your lower ab muscles: Lie straight on the floor and press your lower back to the floor.
You may be learning the plank exercise for the first time or you may already use it regularly in your workouts. I have found it to be one of the most effective abs exercises I use. In fact, one research study found it to rank highly at #4 out of 13 exercises for the oblique abdominal muscles. Not only does it strengthen the abdominal muscles, but also works all the core muscles -- the back, hips, etc. I recommend starting with the first exercise and gradually increasing the seconds you can hold the position. Once you feel comfortable with the plank on your elbows, progress to the next exercise.