The iso hold duck walk in particular felt like my abs were braced within an ... know squats are a great lower-body workout but throw a heavy medicine ball in and a pulse, and your quads and ...

This ab workout includes core-strengthening exercises ... Tip: Hold a dumbbell or medicine ball for extra intensity. 4. Side plank with dips Place one elbow directly under your body and press ...

A trainer outlines how to perform six of his top-recommended standing HIIT workouts for your abs to boost core strength and definition.

We're going to use an ab ball and a floor mat. Make sure you have enough room to spread out. Let's start with a waist crunch. Have a seat on the exercise ... hold onto a medicine ball -- or ...