Seven minutes for a workout — who doesn't have time for that? That's why we've been loving this quick circuit workout from the American College of Sports Medicine, which burns major calories in a short amount of time. Keeping the intensity up — and the rest periods short — is key, so make sure you are pushing yourself during each 30-second spurt! You'll need a mat and a chair or bench. Repeat the circuit up to three times.

Learn how to do all the moves here, and get the printable poster of this seven-minute HIIT workout here.

If your workout needs a little boost, having caffeine before you exercise can be just what you need. Studies have shown that ingesting caffeine before a workout increases your endurance, can help ease postexercise muscle soreness, and can help sedentary people exercise more vigorously. While caffeinated gels, drinks, and chews help give a much-needed boost during endurance races, you should play it safe when it comes to your caffeinated workout. Stay away from energy drinks, and opt for naturally caffeinated options with these tips.

Have a shot: An espresso shot before a workout is convenient, since it won't weigh you down and can be drunk quickly if you're on your way to the gym. Take the shot, which on average contains about 75 milligrams of caffeine, about 30 minutes before your workout to reap the effects of the caffeine during your workout.

Take a coffee break: If you are going to drink a full cup of coffee or tea before you exercise, make sure that you drink it about an hour before so you won't be full of liquid when you work out. Note that a 16-ounce cup of Starbucks coffee contains 330 milligrams of caffeine, so don't drink a full cup before an evening workout if caffeine normally keeps you awake.

Look for caffeinated snacks: A recent study found that eating a small piece of dark chocolate before a workout can help with endurance because it contains a flavonoid that may help muscles resist fatigue. While a small piece of dark chocolate may not contain that much caffeine, the combination of carbs, caffeine, and flavonoids may help give you a small boost. For a bigger caffeinated effect, look for energy gels and chews that contain caffeine.

No matter what your caffeine strategy, if you are training for a race and use caffeine to help your workouts, endurance running and nutrition coach Matt Fitzgerald recommends in his book The New Rules of Marathon and Half Marathon Training to go on a caffeine fast a week or two before your big day. Since your body acclimates to the effects of caffeine, taking a weeklong break will ensure that you feel the greatest effects during your race. You should also take care to not go over the recommended daily intake of 300 milligrams.

Sometimes, all you need is 10 minutes to feel healthier, less stressed, and more fit, all while burning a surprising amount of calories. The following total-body workouts range from five to 10 minutes and will work up a sweat while still keeping your busy schedule in mind.

1. Do-it-anywhere workout: You can do this 10-minute, no-equipment workout anywhere where you have space for your mat; set up your laptop and follow along to our workout video here.
2. Wake-up workout: This short and sweet five-minute workout will help you energize in the morning to get ready for your day.
3. Max HIIT workout: Very high-intensity interval training is the way to go to save time and burn major calories — it's even been proven in studies. This seven-minute HIIT workout is the perfect circuit to raise your heart rate while working your entire body.
4. Yoga with weights workout: Follow along to our 10-minute hybrid yoga workout for a creative way to strength train: with a stretching yoga sequence that incorporates dumbbells.
5. Yoga flow workout: For a more traditional, relaxing yoga sequence, try this 10-minute yoga flow workout video.

Five more intense, short workouts after the break!

Cooking your own meals is healthy and economical, but making that trip to the supermarket without a plan can lead to high-calorie habits. Make sure you don't make these mistakes on your next grocery store run.

Starting in the middle: You should focus on shopping the perimeter of your grocery store, since you can fill your cart with fresh produce, whole grain staples, and protein-rich dairy without being distracted by frozen treats and processed foods. if you're looking to grab a treat or two, make your way to the middle after you've stocked up on your healthy items.

Going hungry: A recent study confirmed what everyone who's ever shopped hungry already knows — you grab more unhealthy and higher calorie foods (think junk food) when you're ravenous. If it's been awhile since you've eaten and it's time to go to the store, grab a healthy snack before you go like yogurt, a piece of fruit, or a protein bar to sate your hunger until your shopping trip is done.

Going without a list: Winging it can work for impromptu farmers market trips, but going for your weekly supermarket trip without a list can lead to an unbalanced nutrition plan throughout the week. Take time to plan your ingredient list so you know what to buy so you don't stray from your healthy recipes and move to prepackaged dinners.

Skipping all prepared foods: You may think that healthy supermarket buys are only found in produce bags, but some days you just don't want to spend the time on washing, dicing, and slicing your way to a healthy snack. Healthy prepared foods save you time, and if you're unlikely to eat something, like carrots or salad, unless it's washed and ready for you, opting for a few prepared foods can help you stay on track. Read more about the healthy prepared foods worth paying for here.

Want to turn your body's fat-burning potential up a notch? Check out these five ways to wake up and up the calorie burn.

1. Exercise: That dawn workout doesn't just put a pep in your step; exercising in the morning also helps boost your metabolism, more than exercising at other times of the day. Studies have shown that people who exercised in the morning burn more calories than those who exercise at other times of the day, so lace up your sneaks and greet the sun for an added calorie burn.
2. Add intensity: Good news for the time-strapped: a recent study found that a simple intense 2.5-minute burst of exercise can lead to an increased afterburn all day — up to 200 calories worth, in fact. Need ideas on how to add intensity to your workouts? Here are five short exercises that will help you burn extra calories fast.

Three more ideas after the break!

You can be excused if your excitement to finally run in good weather has been dampened by a stretch of runny noses, itchy eyes, and nonstop sneezing. Allergy discomfort can be enough to prevent anyone from wanting to skip their daily workout, so keep sneezing and sniffling at a minimum with these tips for dealing with allergies while on your outdoor runs.

Check the counts: Some days are just made for the treadmill, especially if high pollen counts would mean you'd be suffering through your entire outdoor run. Make a habit of checking pollen and mold counts every day, and ditch your outdoor exercise when counts are the highest. Try Pollen.com for forecasts in your area. If you're not quite sure what triggers your allergies, then go to the doctor for an allergy skin test that will help you figure out what to watch out for.

Pick your time: Pollen counts are usually the highest in the mornings, so if you are feeling sneezy and stuffed up after every morning run, then try to move your running time to later in the day. Going in the evening may be your best option.

Change out of your clothes: Exercise clothes can carry allergens, so make sure you change — and shower — as soon as you get home to limit your exposure.

Prevent discomfort: If you know you're going to be running in high-allergen situations, then take a few preventative steps to make your workout a success. Wear sunglasses to protect your eyes from pollen, and take your allergy medication — as long as it's nondrowsy and nondrying. Medication and inhalers that open up your air passageways can actually make your symptoms worse, so plan to take these at least an hour before your run.

Today, Angelina Jolie announced in a New York Times op-ed piece that she underwent a double mastectomy and reconstructive surgery as a preventative measure. Because she inherited a certain "faulty" gene, her risk of breast or ovarian cancer — which her mother died from — was very high.

Mutations in these genes, called BRCA1 and BRCA2, are the most common cause of hereditary breast cancer, which tend to strike younger women. Angelina's risk, which she said was over 80 percent, is typical in many who carry one of these gene mutations. BRCA1 and BRCA2 mutations are also associated with a high risk of ovarian cancer.

Angelina's difficult decision is one many people who have a high hereditary risk of breast cancer make, since opting for preventative surgery can reduce your risk to much lower levels; post-mastectomy, Angelina says that her breast cancer risk is now under five percent. Last year, for example, Miss America contestant Allyn Rose spoke about her decision to undergo a preventative double mastectomy after the pageant because of her high hereditary risk. In 2008, actress Christina Applegate opted for a double mastectomy, after being diagnosed with cancer in one breast, since testing found that she carried the BRCA1 mutation.

The only way to know if you carry these gene mutations is to get a specific blood test. There are certain patterns that make it more likely that you have these mutations, such as two first-degree relatives (like your mom, daughter, or sister) having breast cancer before age 50, a combination of first- and second-degree relatives (such as a grandmother or aunt) being diagnosed with either breast or ovarian cancer, a first-degree relative diagnosed with cancer in both breasts, or a male relative who was diagnosed with breast cancer. The patterns for those of Ashkenazi Jewish descent, who have a higher risk of inheriting BRCA1 or BRCA2 gene mutations, are different; get the risk pattern lists for everyone here. If an immediate family member is diagnosed with breast or ovarian cancer, they are often tested to see if they carry the gene; if they do, you can also undergo testing to see if you also have the mutation. Making the decision to see if you've inherited this gene mutation, and what to do about it, can be difficult; the National Cancer Institute suggests genetic counseling before and after your blood test to help you make the right decision for you and your family.

While you can't change your genetic risk for getting breast cancer, there are some lifestyle changes that can reduce your risk; read our list of 10 things you can do to help prevent breast cancer here.