"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Ready to revamp your workout routine—and get lasting results? Enter: the Women's Health 30-Day Workout ...

I don't have any real issue with sit-ups, but my tailbone isn't a fan. The good news is you don’t need to do sit-ups to build a strong core. If you're like me and can take or leave sit-ups, there are ...

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Instructor: Helen Ortiz has been teaching group fitness for two years. She teaches indoor cycling as well as a hammock class at Define. What is the workout? A 45-minute rhythmic cycling class. High ...

If you're working towards a lean, defined flat stomach, these exercises will ensure you have the core flexibility you need. Use this as a stand alone circuit or as part of the ultimate 4 week abs ...

When you're too busy for workout classes and too broke for a gym membership, it can be tough to figure out what counts as a good workout in your hectic lifestyle. Like, does walking an extra 10 ...

We've got a 15-minute ab routine that will help you build a strong and functional core without lifting a single extra pound. Perfect for doing at home, in the park, or wherever you feel like it! The ...