That's why we spoke with a fitness pro who outlines a stellar seven-day core strength challenge ... side. Sit on the floor with your knees bent and feet lifted. Hold a weight at your chest.

That's why we spoke with a fitness pro who outlines a stellar seven-day core strength challenge ... side. Sit on the floor with your knees bent and feet lifted. Hold a weight at your chest.

In this six-part series, we'll give you quick exercises for different body parts every week to help you stay limber.

The Band Push Sit-Up adds an exciting twist to a foundational core exercise, offering targeted resistance that challenges ...

Avoid sagging into your hips and chest Pause at ... while keeping your stomach tight and toes pointed. You could also try sitting and leaning back slightly to challenge your balance.