Tone Your Abs in 10 Minutes With This Equipment-Free, At-Home Core Circuit

Toning belts, ab rockers and sweat-inducing lotions might give your wallet a workout, but they won't do much for your core.

So save your money: The only tool you need to get the strong abs of your dreams is your own body (well, that and some persistence).

In this equipment-free routine with Luke Milton, certified personal trainer and founder of the online HIIT program Training Mate, you'll work your entire core — including your oft-overlooked obliques — in just 10 minutes.

Yep, 10 minutes. But don't think it's going to be easy; keep a towel nearby because you can expect to sweat, Milton says. "We are sweat-friendly at LIVESTRONG.com and we love it."

We also love a quick workout; you don't need to spend hours on exercise when you're sticking to tried-and-true ab-building techniques. As Milton says: "You are going to have a taut, terrific ab section in no time at all!"

You'll perform five exercises for 45 seconds each with a 15-second break between moves for two rounds.

1. Bicycle Kick: As you kick each leg, focus on twisting your upper body into your knees with your shoulders off the ground the entire time.
2. Plank Series: Keep your elbows directly beneath your shoulders, Milton says. When you have 20 seconds left on the clock, come to a high plank and alternate tapping your shoulders and hips.
3. 90-Degree Crunch: Try to maintain a 90-degree bend in your knees for the entire 45 seconds. If you need a modification, place your feet on the ground and crunch all the way up so your elbows meet your knees, he says.
4. Side Plank: Plank on one side in the first round and switch sides in the second round.
5. V-Sit: Challenge yourself to keep your feet lifted as you fatigue.