To give you some extra motivation for building your core, we put together this 30-day ab challenge with the ... How to do this challenge: Each workout listed below is its own circuit.

Welcome, Women's Health+ members! As part of your membership, you get exclusive access to PDFs of our 30-day fitness challenges, including this Abs Challenge created by Chelsey Wilkens ...

and while we have plenty of variations of these classic core moves in this 30-day ab challenge, many of the exercises also incorporate functional fitness. "We incorporated a lot of exercises that ...

For an added challenge ... training workouts with one or two core exercises. However, most fitness experts recommend dedicating two to three specific days per week to a focused ab routine.

In fact, this program is one of the most efficient and effective ways to exercise, she adds, because after each 20-minute ... of the four challenge workouts on the designated days, and then ...