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.
Crunch on Exercise Ball: This exercise not only build your abs but also promotes balance and stability. Crunch on exercise ball is a highly effective exercise to build upper and middle ab muscles. Check out the proper way to do this exercise: Sit on the ball and keep your feet straight on the floor.
Repeat this exercise a number of times for a complete set. 2. Ab Rollout. This is one of the toughest bodyweight ab exercies that you can do and one of the best stomach exercises in general. You can do the ab roll-out with an Ab Wheel or Valslides. You can also do it with a smooth sock on each hand. Either way, it will work you hard.