Start with this 7-day challenge constructed by Men's Health fitness director Ebenezer Samuel, C.S.C.S. It’s built with the busy guy in mind and is particularly well-suited to beginners.

This beginner ab workout has tons of modifications and challenges listed below to decrease or increase the difficulty of each core exercise to give your body a challenge, even as you grow stronger!

You may like No more crunches! Build a strong, stable core with these 5 standing ab exercises Forget sit-ups — sculpt your abs in 10 minutes with this standing dumbbell workout ...

Core strength goes deeper than aesthetics — it’s essential for preventing back pain and injury and improving sports performance. This beginner ab workout will get you started. Nearly every ...

This 20-minute ab workout is suitable for beginners and strengthens your core using four abdominal exercises. Talent trainer Harry Sellers explains how to do it.

Three to four days of workout is more than enough for 9 to 5 employees. If you have enough time to take up a tough challenge like the 75 hard challenge, then go for it.

Jennifer Nied did trainer Jenna de León's 7-minute dumbbell abs workout every day as part of the 28-day challenge. There are her before-and-after results.