Some of the good ab workouts that can be done at home are the crunches and sit-ups
. You only need a mat for you to perform all these routines on. However, if you aim for the more advanced exercises, then it would be a good idea to buy some exercise equipment that can be used at home. Simply choose the more basic ones so you won't have to spend much and defeat the purpose of quitting your gym sessions. The stability ball and some dumbbells may be what you need for crunches. You must keep it in mind though that if you would like to have a good ab workout such as one performed at the gym then you may need to intensify your exercises gradually.