Sit-ups have always been rough on my back (being a bit top-heavy, I can never seem to keep my low back flat to the floor), so when my husband told me about this article he read last week, I had to go find it for myself.
Five Reasons to Never Do Sit-Ups / Crunches again. (BONUS: it's VERY short.)
Of course, this does NOT mean I get to skip my core work: planks, side planks, side planks with pulse, Russian Twists, nearly anything with a Bosu Ball... Especially with all I've learned from my physical therapy sessions the past few weeks, I absolutely need to work that core for a healthier, stronger body!!
Here are some of my favorite options (and some I want to start using):
Basic Plank (classic; I do this all the time, always challenging
Side Plank (I also like to do this one with a "pulse" - point your arm to the ceiling and :pulse: your hips to the side (up toward the ceiling)
Lunge with Rotation (This looks difficult to me; haven't tried it yet, but it incorporates a lot of what my PT is wanting me to work on.)
Bosu Ball Forearm Plank
Bosu Ab Twist
Here's one on the Stability Ball: Back Extension Rear Leg Raise
Check this out for other options! 25 Variations on the Plank
In my hunt for pics / video I found this terrific list of Bosu exercises: 41 Exercises to Do on a Bosu Ball.
Best Ab Workouts for Women
8 Killer Ab Exercises (Active.com) - looks like you may need at least the free Active.com membership to read this article.