The Best Workout for the Time You Have

Every second counts, especially when it comes to fitting fitness into your super-busy life. So pick one circuit from the 60 Seconds to a Slimmer Body workout when you have a minute, or combine them for a longer interval training routine.

Hayden Panettiere's 3-Minute Pilates Workout combines back-to-back plank variations to help you burn fat for a toned tummy in no time.

You can work off 15 calories a minute doing this Home Tabata Workout. You have to give it your all—expect some serious heavy breathing—and you'll feel amazing after.

5-Minute Workout for Fabulous Flab-Less Arms sounds too good to be true, but it really does target those trouble spots thanks to 30-second bursts of bodyweight exercises.

Get ready to feel the burn! It's only three exercises, but the 6 Minutes to Slimmer, Stronger Thighs workout sculpts your stems so you're ready for skinny jeans, leggings, short shorts, you name it!

Grab a set of dumbbells for the 7-Minute Fit-in-a-Flash Workout. You'll check off your strength and cardio, and be back to the rest of your day in less time than it takes to choose your outfit some mornings.

Whenever you oversleep or are stuck at the office late, rather than skip your workout, squeeze in the 8-Minute Missed-the-Gym Workout. This fast, equipment-free routine will help lower your stress as you tone all your key muscles.

The plank. So deceivingly simple yet hard. And so effective. The power plank workout video combines instability and dynamic plank exercises to trim and slim your middle while improving posture so you naturally look even thinner.

We all like a two-fer, and a flat belly and flat-free arms—in 10 minutes!—is a deal you don't want to pass on. The 10-Minute Arms and Abs Workout hits both body parts in every move for maximum toning.

Kick your metabolism into high gear and build lean, sexy muscle with this Insane Workout. The non-stop high-intensity intervals work every major muscle group with an effective combination of cardio and strength training.

Bid adieu to 300 calories with the Killer Kettlebell Workout. You'll carve your core, sculpt your shoulders and back, and tone your butt and arms, as well as build power and boost endurance in seven moves.

Instead of using treadmill, turn your body into a fat-burning machine with this Metabolism Booster workout video.

If your goal is fat loss, this insanely effective Proven Way to Melt Fat Fast workout is a must. The metabolic resistance training (MRT) maximizes caloric expenditure while also increasing your metabolic rate.

Cardio can sometimes get boring. We've got the solution—five of them. Pick from treadmill, stair stepper, bike, or no equipment at all and burn 500 calories in 30 minutes.