Side plank with hip adduction
This is a tough one! A side plank will challenge your hips, shoulders and core, but when you add an adduction, you'll also be trimming your inner thighs. Use a Lebert Equalizer or bench, and balance one leg on top of the tool with your body in a side plank position. Raise and lower your other leg while holding the plank. Aim to perform 10 to 12 on each side.
Photo Credit: Girls Gone Sporty