How to do sit-ups the right way, according to personal trainers

What you're doing wrong—and how to fix it.
What you're doing wrong—and how to fix it.

Sit-Ups Benefits: Exercises, Variations, and More

Hiring The Right In-Home Personal Trainer for You: The Key to Long

Why Sit-ups Are Bad For Your Back and the Right Exercise To Try

Sit-Up vs. Crunch Sit-Up and Crunch Circuit

How to Do Sit-ups the Right Way, According to Personal Trainers - Yahoo Sports

Live Well Magazine - Lifestyle News on Food, Sex and Drink, Page 91

4 Ways to Do Sit Ups - wikiHow

Why you need the world's fittest book in your life, British GQ

Why you need the world's fittest book in your life, British GQ

How to Do the Sit-Up

Sit Ups and Co. - how to train properly - Urban Sports Club Blog