best cardio for weight loss

Ask any runner who's naturally slim: There are a bazillion reasons to exercise that have nothing to do with losing weight. But if weight loss is your main motivator, make sure every minute of exercise counts with these tricks to burn more calories during exercise:

1. Clock more aerobic cardio. Any activity that permits you to talk but makes it difficult to carry out long conversations (i.e. aerobic exercise) is a secret weapon for weight loss, says Edward Jackowski, Ph.D., founder of EXUDE Fitness training programs and author of Escape Your Weight. Unlike weight lifting or uber-intense, unsustainably difficult activities (i.e. anaerobic exercise), most people can physically sustain aerobic exercise for long enough to burn a substantial amount of calories. It's why anyone trying to lose weight should spend about 60 percent of their gym time on cardio and just 40 percent doing other stuff.

2. Actually work. Going through the motions won't help you lose weight — even if you half-ass it for 45 minutes. "From a scientific perspective, it's the intensity of exercise that raises the metabolism," says Jackowski. Instead of worrying about your heart rate, stick with this rule of thumb: If you don't feel winded and you have the capacity to step it up, you should be moving faster. So long as you tax you system, you'll benefit just as much as someone who's more fit and running faster th
an you on next treadmill.

3. Fluctuate between different intensities. When you change things up, every system of the body has to adapt, explains Franci Cohen, an exercise physiologist, certified nutritionist, and founder of the Brooklyn, New York-based Fuel Fitness. If that sounds like an awful lot of effort, that's because it is — and that's good. The more work you give your body to do, the more fuel (calories!) it needs to burn to get the job done.

So, several times throughout your workout, alternate between fast-paced aerobic exercise and exercises that are way too hard to keep up for more than a minute.

While the hard stuff burns more calories per minute than aerobic exercise and increases your metabolism for hours after you leave the gym, you can't keep up that pace forever. Alternating between four minutes of steady-state cardio in the aerobic zone, and one minute of unsustainably intense cardio gives you the most bang for your buck.

4. Do not fear weights. While lifting weights won't necessarily burn fat, it will build muscle. The more muscle you have, the more calories your body burns after you leave the gym and plop down on the couch, Jackowski explains. Another thing: Weight training keeps your mu
scles in shape so they looked toned when you shed the fat that's now covering them up.
5. Exhaust whatever muscle you're working. That burning sensation you get in your thighs after doing lots of lunges? That's means you've reached your anaerobic threshold — you've worked as hard as you possibly can, and you've burned more calories because of it.

6. Alternate between working different muscle groups. Also known as cross-training, this technique helps you sustain a higher level of intensity for longer than you would if you'd simply stuck with working one area. So move onto overhead presses as soon as your legs are spent from doing lunges. Once your legs recover, you can pick up where you left off with a set of squats, box jumps, or another form of lower body torture toning.

7. Stop wasting time between exercises. Bathroom breaks and other excuses for dillydallying give your heart rate a chance to return to normal. But the longer you keep it elevated, the harder your body will have to work and the more calories you'll burn.

8. Warm up — especially in the morning.When you go from 0 (sleeping) to 50 (sweating) first thing in the a.m., you sort of shock the heart, Jackowski explains. People who do intense anaerobic exercise in the morning without a warm-up tend to be more tired (aka lazy) throughout the day. A 10-minute a.m. warm-up can take the edge off so you're more active after the gym, which will increase your overall calorie burn.

8. Relax with the marathon workouts. You might feel like a rock star when you double up on fitness classes or outlast the girl on the next elliptical. But unless you're a pro athlete or you're training for a competition, "no one needs to work out for more than an hour and 15 minutes — more is not better," Jackowski says. Overdo it, and you'll set yourself up for stress fractures, insomnia, and exhaustion, all of which could put an end to your exercise routine and stand in the way of your weight loss goals.

9. Engage your core during every exercise. Most exercises involve your core in some capacity — and even more so if you remember to squeeze it. And you burn more calories when you work larger muscle groups (your abs and back) than smaller muscles (like biceps), Cohen says. To max out, engage all these groups at once — and try some moves that involve rotation, such as plank twists. (They're the human version of wringing out a towel — just imagine squeezing out the fat for a narrower, tauter waistline.)