ab workout using towels:

Do one of the following workout plans:
 * 4 sets of 8-12 reps
 * (better workout) 1-4 sets of 5-10 reps, holding each rep for 5-10 seconds
 * (even better workout) 1-2 sets of 1-3 reps, holding each rep for 20-60 seconds

To make this easier: stand closer to the wall, and/or try kneeling on your knees
To make this more difficult: stand further from the wall, and/or wear a weight vest
 


Once you've watched the instructional video above and learned how to do this workout, do the 4-minute ab workout in the BELOW video 1-3 times a day, 1-2 times a week.

To make this easier: Do 10 reps for 5-10 seconds, stand closer to the wall, and/or try kneeling on your knees
To make this more difficult: Do 10 reps for 10-30 seconds each, and/or wear a weight vest
To make this even more difficult: Do 10 reps for 60 seconds each, and/or wear a weight vest
blah