It’s time to push your abs to exhaustion —not to mention, fight the flab— with new abs exercises that are anything but routine. And it’s not just a six-pack you’ll get: Maintain strong abs and you’ll help prevent back pain, boost your agility, and increase your flexibility. A superbusy lifestyle means that you can't always make it to the gym — but at-home workouts don't always have to be a drag. You can work out your core and build a good set of abs in the process by working out in your bedroom, living room, or anywhere in your home. No matter how busy your day, you can always sneak a quick ab workout into your routine. You'll be seeing results in no time. Ready to mix up your routine? We've rounded up 15 easy and challenging ab workouts you can do without leaving your home.