This first exercise is a great home gym/beginner exercise. The reason I say that is because it's on an exercise ball so you don't need a bench.
Disclaimer: You are attempting these exercises at your own risk. You should get clearance from your doctor before starting any exercise program. Neither WarriorTeams.com or your employer will be responsible if you get injured while attempting any of the exercises in the member section. If you don't clearly understand an exercise, you should hire a personal trainer to make sure you have proper form and understand clearly what you're doing.
*** Warning one thing I want you to be careful of is if you're older or have knee problems getting on an exercise ball can be difficult. So try a bench or you may want to start with a personal trainer. Proceed at your own risk.
The easiest way to get on your back on an exercise ball is to simply sit on it, then lay back as the ball rolls up your back move your feet out. You'll see me do it in this video.