P90X is a workout that can be done at home, but it is very challenging. The workout involves 12 specific exercises that are done in a specific manner for 90 days, after which you should see improvements in your fitness level.
You can order videos online or you can watch you tube for the long list of ab workouts. You tube i think would be the easiest place because youre not paying for anything and you can follow the video...
Pilates is an easy workout that you can do at home. You will need a few things such as small weighted balls, foam rollers, large exercise balls to use as props.
Easy workouts at home can include cleaning your house, gardening, chair exercises, sit-ups, stationary bike, treadmill or walking or running in place. There are unlimited opinions. Find something...
You can do really easy workouts such as lunges or other certain stretches. Ab workouts are also super easy to do at home. Pilates is a great idea for in home use.