1. Crunches
The standard crunch exercise will work just fine.
2. Abdominal Sit-Ups
All you need
for this one is a rolled-up towel. Place the rolled-up towel in the small of your back just above the waistband and do a regular
sit-up from there. The towel changes the leverage and forces the abs to do the bulk of the work.
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3. Luggage Squats
This is a variation of an exercise I call the Curl Squat. Grip your luggage with two hands (one on either end)
and hold it at face level just in front of you, a few inches from your body. Be sure you're NOT holding it against your
body but that it's supported just by your arms. Now squat down as far as you can and back up. Holding the luggage in that
position will activate the abs VERY strongly.