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By Jessica Girdwain




Exercise with this in mind: Research reveals that when it comes to reaching a specific goal, the kind of workout you do may matter as much as how many hours you clock at the gym. These five fitness routines get results -- choose the one that's right for you.


Your goal: Get a killer body.

The game plan: High-intensity interval training (HIIT), which alternates between moderate and intense bursts of cardio. On the machine of your choice (bike, treadmill, elliptical), start with three minutes at an easy pace, then increase the speed or resistance and go hard for one minute. Repeat sequence for a total of 20 minutes, two to three times a week (give yourself 48 hours between workouts).

The proof: A small study in the Journal of Applied Physiology found that subjects who did seven HIIT sessions over two weeks increased their body's fat-burning ability by 36 percent. HIIT keeps your metabolism elevated long after you're done, so these workouts can be shorter than a normal cardio session and deliver the same results.


Your goal: Lower your type 2 diabetes risk.

The game plan: Cardio plus strength training. Aim for a 30-minute cardio workout five days a week. And do strength exercises, like three sets of squats, push-ups, and biceps curls (eight reps each), three times a week. [To get step-by-step instructions for how to do these moves like a pro, click here.]

The proof: A 2012 study in the Archives of Internal Medicine found that people who did both cardio and strength training for at least 2.5 hours a week each had a 59 percent lower risk of diabetes -- lower than those who did only one type of exercise. While the study was done on men, researchers believe it could work for everyone, because the heart-pumping cardio incinerates body fat, while strength training helps keep blood sugar levels in a healthy range.


Your goal: Build muscle.

The game plan: Weight lifting with light weights on two to three nonconsecutive days a week. Using three- to five-pound dumbbells, perform three sets of 20 to 25 reps of the following moves: shoulder presses, dumbbell rows, chest presses, biceps curls, and squats.

The proof: A recent report from McMaster University suggests that doing more reps with lighter weights to the point of exhaustion leads to similar gains in muscle mass as fewer reps with heavier weights. Because fast-twitch muscle fibers (which contribute most to strength) are activated longer, researchers believe this could even bring about greater muscle growth.


Your goal: Lose post-pregnancy pounds.

The game plan: Circuit training -- a series of exercises with little to no rest in between -- three days a week. Cycle through three sets of push-ups, squats, and side lunges, doing as many as you can without stopping. Take a one-minute break between circuits.

The proof: Research from Shippensburg and California State Polytechnic Universities found that circuit training boosts your metabolism better than a similar-intensity treadmill workout. In fact, you burn 30 percent more calories doing circuits than you would with strength training alone, says exercise scientist and physical trainer Brad Schoenfeld.


Your goal: Prevent high blood pressure.

The game plan: Walking. Lace up your sneakers and power walk for 24 minutes.

The proof: Doing this short walk daily could slash your chances of developing high blood pressure by 42 percent, according to a recent study in the journal Hypertension. Study author Robin Shook says the regular exercise may help regulate your body's "fight or flight" stress response and, as a result, keep blood pressure down.


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Earlier On HuffPost:





  • Yoga


    Yoga offers a <a href="http://www.huffingtonpost.com/deepak-chopra/yoga-heart-health_b_900621.html" target="_hplink">myriad of wellness benefits:</a> flexibility, balance, centeredness, strength, mindfulness and others. Yoga is a great option for aging bodies, as it promotes working within your own comfort zone. Postures and sequences range from gentle and relaxing to more intensive for advanced yogis.




  • Stretching


    Another way to promote flexibility and overall health is incorporating some simple stretches into your daily routine, be it at home, at the gym or even outdoors. Stretching prevents injury, <a href="http://www.huffingtonpost.com/2011/10/24/yoga-stretching-back-pain_n_1029014.html" target="_hplink">can relieve back pain</a> and boosts energy. Note: It's important to stretch properly to avoid injury. Check out some good <a href="http://www.webmd.com/fitness-exercise/healthtool-basic-stretches" target="_hplink">examples of stretches here</a> and these <a href="http://www.huffingtonpost.com/2011/07/08/stretching-mistakes_n_892444.html#s304603&title=Not_Doing_It" target="_hplink">common stretching mistakes</a>.




  • Biking


    Biking is a great low-impact, cardiovascular workout, not to mention it's a lot of fun. There are a few ways to incorporate biking into your routine. Joy rides in your free time are always a good option -- alone or with a group. You could consider joining a local bike group or riding to nearby destinations instead of taking the car. <a href="http://www.livestrong.com/article/456032-stationary-bikes-and-health-benefits/" target="_hplink">Stationary bikes</a> also have great health benefits. Already a cycler? Here's how to get <a href="http://www.huffingtonpost.com/2011/05/30/6-ways-to-get-more-benefi_n_868670.html#s285033&title=Get_in_tune" target="_hplink">more benefit from your bike ride</a>.




  • Brisk Walks


    One of the most <a href="http://www.mayoclinic.com/health/walking/HQ01612" target="_hplink">beneficial exercises</a> is something humans have been doing for centuries: walking. Simple modifications to your routine, like parking further away and walking the extra distance or taking the stairs instead of the elevator, can really add up to boost your overall health. For an even greater benefit, take brisk walks that get your heart rate up.




  • Pilates


    <a href="http://pilates.about.com/od/whatispilates/a/WhatIsPilates.htm" target="_hplink">Pilates</a> is another low-impact exercise that's ideal for aging bodies. It's similar to yoga but puts more emphasis on gaining control and balance of the body by strengthening the core muscles. Pilates can be done in a class or at home with a video or other guide. <a href="http://www.huffingtonpost.co.uk/paola-bassanese/keep-fit-with-classical-p_b_987756.html" target="_hplink">This piece</a> offers a great run-down of the activity, along with images of some classic pilates stretches and workouts.




  • Tennis


    Tennis is a classic sport, well-loved for being fun and <a href="http://my.clevelandclinic.org/heart/prevention/exercise/tennis.aspx" target="_hplink">great for you</a>. It's a strong aerobic workout and helps keep you agile, especially important as you get older. Tennis is also a very social activity -- great for the body, mind and spirit!




  • Swimming


    Swimming is easy on the body and is also one of the most comprehensive workouts, hitting <a href="http://www.webmd.com/fitness-exercise/guide/fitness-basics-swimming-is-for-everyone" target="_hplink">all the major muscle groups</a>: shoulders, back, abdominals, legs, hips and glutes. If you're getting serious about swimming, it's important to learn proper techniques, but even free-styling in the local pool or outdoors in the summer is a great way to exercise.




  • Dance


    Dancing is one of those activities that doesn't feel like working out, but is an incredible <a href="http://www.livestrong.com/article/91589-fitness-benefits-dance/" target="_hplink">aerobic exercise</a>. It's a good option for those that want more physical activity but don't like the gym or in the winter when it's harder to get outdoors. There are a bunch of styles to choose from: ballroom dancing, contra dancing, salsa, ballet, tap, country and others.




  • Elliptical


    As the body ages, running and jogging can take a toll on the joints, knees or back and potentially cause injury. An elliptical cross-training machine is an alternative to running, which still gets your heart rate up but at a <a href="http://www.mayoclinic.com/health/elliptical-machines/AN01620" target="_hplink">lower impact</a>.




  • Strengthening Exercises


    You can take a simple walk to the next level by bringing weights along to build strength in your arms and boost the cardio benefits. Strength-building techniques like pushups, squats and lunges are easy to do at home or can be squeezed into buckets of free time throughout the day.





Also on HuffPost:






  • Indoor Cycling


    The progenitor of the exercise bike, the “gymnasticon” <a href=”http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1043941/pdf/medhist00025-0079.pdf”>was patented in 1798</a>, but it wasn’t until 1989 that the <a href=”http://www.livestrong.com/article/546276-the-history-of-indoor-cycling/”>first dedicated indoor cycling center opened</a>. Since that time -- with the proliferation of spinning and studio chains like SoulCycle, FlyWheel and others, the activity shows no sign of abating.




  • Sit Ups


    It may be that "crunches" and sit ups are a thing of the past, as <a href="http://www.thedailybeast.com/newsweek/blogs/the-human-condition/2009/06/03/stop-doing-sit-ups-why-crunches-don-t-work.html" target="_blank">many back specialists</a> believe the classic move is hard on your spine’s most vulnerable points.




  • Bicycle Kicks


    While this model's form is questionable, the American Council on Exercise ranked a similar move as <a href="http://health.howstuffworks.com/wellness/diet-fitness/exercise/three-exercises-for-a-tighter-you.htm">the most effective abdominal exercise</a>.




  • Vibrating Belt Machine


    These machines have been routinely dismissed, although updates to neuromuscular electrical stimulation have improved such that one study found a <a href="http://www.jssm.org/vol4/n1/9/v4n1-9pdf.pdf" target="_blank">marked improvement to abdominal strength</a> among a group of healthy, young adults. Still, there’s no replacement for real movement and body resistance training. Skip the belt -- try a bicycle kick.




  • Boxing


    Going after a punching bag is a great way to get in shape. "If you want to tone up your midsection, arms, thighs and glutes, boxing is by far one of the most effective workouts you can do,'' boxing trainer and former World Middleweight fighter, Michael Olajide, Jr. <a href="http://www.acefitness.org/healthandfitnesstips/healthandfitnesstips_display.aspx?itemid=332" target="_blank">told ACE</a>. ''The secret is you get cardio and toning benefits simultaneously.''




  • Running Together


    Sneakers and “breathable” wicking fabrics are all that separate this jog from the one you did this morning. And having a workout pal can keep motivation going strong and even help you lose more weight, <a href=”http://www.womenshealthmag.com/fitness/partner-workout”>according to Women’s Health</a>. Extra points if your running buddy <a href=”http://www.fitsugar.com/Get-Physical-Go-Jog-Together-262757”>is also your romantic partner</a>, which can improve your relationship as well as ensure future fitness.




  • Strength Training


    Using weights to build muscle mass has <em>never</em> just been for body builders. Anyone looking to <a href=”http://www.womenshealthmag.com/weight-loss/weight-training-tips”> tone their bodies</a> and help prevent <a href=”http://www.cdc.gov/physicalactivity/growingstronger/why/”>age-related illnesses like arthritis and osteoporosis</a> can benefit.




  • Medicine Balls


    This old-fashioned look tool is enjoying a resurgence thanks to growing popularity in strength training. And research shows that the balls can help <a href=”http://www.ncbi.nlm.nih.gov/pubmed/17685676”>improve strength and power</a>. Want to learn how to use a ball? Check out Greatist’s <a href=”http://greatist.com/fitness/25-must-try-medicine-ball-exercises#footnote-1598-1”>list of 25 exercises</a>.




  • Rowing


    Rowing machines may date back to the 1800s, but they’re also the latest boutique studio fad, according to Details Magazine, who reported that the trend <a href=”http://www.details.com/health-fitness/exercise/201206/why-rowing-is-the-new-spinning-technique-classes-workouts-races”> can “work your calves, quads, hamstrings, glutes, abs, obliques, pecs, biceps, triceps, deltoids, upper back and lats.”</a>




  • Jump Rope


    This kids' pastime doubles as a great workout that's as portable and easy-to-do as it is effective. That's because it <a href="http://www.webmd.com/fitness-exercise/features/skipping-rope-doesnt-skip-workout" target="_blank">burns calories at a high rate</a>, engages the upper and lower body as well as the core, and also creates impact that helps maintain bone density.