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Sit-up vs. planks: What's better for your core ? Here's what to know

Sit-up vs. planks: What's better for your core ? Here's what to know

This Is How Long You Need To Hold A Plank To See Real Results - Yahoo Sports

Strengthen your core, improve your stability with the L-Sit

Planks vs Crunches vs Sit-ups: What's the Best Way to Build Your Core?

Sit-Ups vs. Crunches: What's the Difference?

7 Exercises To Build Up Your Core if You Hate Sit-Ups

How to Get a 6-Pack: Best Workout for Abs

Fitness Experts: Sit-Ups Are Worthless, Here's What to Do Instead

Tired of Sit-Ups and Crunches? Try These Exercises for Your Core Instead

The 10 Minute Abs Workout You Can Do If You Absolutely Hate Planks

The Health Benefits of Plank Exercises and How to Do a Plank Properly

Are Sit-Ups an Effective Exercise for Weight Loss?

I did 50 walking planks a day for a week — here's what happened to my abs