How to Do a Floor Straight-Leg Reverse Crunch

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By Sarka-Jonae Miller
eHow Contributing Writer

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A straight-leg reverse crunch is an advanced version of a bent-leg reverse crunch. It targets your lower abdominals, whereas a regular crunch works mainly your upper abs. The straight-leg version requires some preexisting abdominal strength, so it may not be recommended for a beginner.

Difficulty: Moderate

Instructions

Things You'll Need:

Step 1

Lying face up on a mat, bring your legs straight up toward the ceiling. Let your arms rest comfortably next to your sides. Your legs should be straight, but do not lock your knees. Draw in your ab muscles and push your lower back down into the mat. Think of squashing a hand or similar object beneath your lower back so there is no space.
Step 2

Breathe out and slowly lower your legs. You may keep them a fist's width apart. Keep your back flat.
Step 3

When you feel your back start to lift from the floor, stop moving your legs and hold that position for two to three seconds. Do not let your back lift a millimeter. If you need to, have a friend place their hand under your lower back and tell you if they feel any less pressure.
Step 4

Breathe in and raise your legs back up straight toward the ceiling.
Step 5

Repeat 12 to 15 times, or as prescribed by your fitness professional.