Use this 30-day abs challenge designed by a certified trainer to sculpt and strengthen your abs and back in four weeks using bodyweight movements.

Every day for the next month, we challenge you to strengthen and sculpt your core in a new way. Follow our 30-day ab challenge to get an ab exercise each day.

I've designed this 30-day abs challenge to ensure you never get bored while sculpting and strengthening your core in as little as five minutes per day.

The next seven days in our 30-day challenge is geared toward continuing to improve abdominal stability and deep core strength, this time with some more challenging exercises.

This 30-day ab challenge provides workouts and exercises to strengthen your core muscles and start a new healthy habit.

Join the Women's Health 30-Day Workout Challenge to get stronger with customizable daily bodyweight and dumbbell workout plans, perfect for all fitness levels.

Use this 30-day abs challenge designed by a certified trainer to sculpt and strengthen your abs and back in four weeks using bodyweight movements.

Add some fire to your month with this 30-day plank challenge, designed to strengthen your core — and put your upper body to work too.

What is the Prime Women 30-Day Fitness Challenge? The Prime Women 30-day fitness challenge is an opportunity to join other women in pursuing better health and wellness in the new year. It includes ...

The 30-day fitness challenge has been around since the dawn of the Internet age, but there’s still no consensus as to whether or not it’s an effective training tool. This is partly due to the ...

I did hanging leg raises every day for 30 days to strengthen my abs and transform my training. Here's how a month-long challenge transformed my core?