When you put on a couple of pounds, it's easy to ignore it. But eventually, if you keep putting on weight, there will come a point at which you know things just have to change. Maybe it's a depressing shopping trip, or a photograph. Or, if you're Kevin Smith, it's when you break a toilet.

The director/writer/actor has been conscious of his size for some time now -- his doctor called him morbidly obese, which is sure to get anyone's mind on losing weight, but it was after breaking a toilet that he really realized that he needed to do something.

"I'm going away for a while to concentrate on myself," said Smith, "to save my life." Once he's done doing press for Zack and Miri Make a Porno, he plans to get away and focus on counting calories and losing a bunch of pounds. It sounds like he's in a bad place, but he's got a plan, and I hope he's got plenty of friends to help him through it -- we all know support makes a big difference!

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Exercise -- it's part of what's necessary to lose weight. But, for extremely obese men and women, even light exercise can sometimes prove too much on tendons and ligaments.

A study published in Medicine & Science in Sports & Exercise reveals that light exercise, such as as regularly-paced walking, can increase a person's risk of osteoarthritis if they're obese. Overweight walkers were found to have 51 percent more muscle torque -- the force that pulls on muscles, tendons, and ligaments and leads to the breakdown of cartilage -- than people whose weight was in a healthy range.

This doesn't mean that exercising is too dangerous and should be avoided if you're exceptionally heavy. Rather, it merely highlights the fact that extra care needs to be taken, which should include a discussion with your doctor and/or specialist about the right fitness protocol for you.

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Have fitness questions? Fitz has your answer. Our ThatsFit.com fitness expert -- and now your own virtual personal trainer -- will help you get fit, increase your overall health and do it in a fun way. Drop your questions here in the Comments section below and we'll choose one per week to publish on That's Fit! Learn more about Fitz here.

Q. Hello Miss Fitzness, I see you have an extensive history as a kickboxer. I also like to kickbox, although I've never actually had a fight. I've since left my trainer though. I have bought a water based heavy bag, and know all of my punches and kicks. It's just hard to come up with things to do each round like my trainer you to have me do. I'm getting bored now without a goal. Have any advice? Scott

A. Hi Scott! Thanks for asking! Yes, my competitive kickboxing days go way back to the mid 1990s and I'm still desperately in love with the sport. It's a ton of fun, and a tremendous workout. Plus ... I personally enjoy kicking people in the head! Only those who have willingly signed up for a charming bit o' competition though, of course! I have also spent the past 15 years as the Fitness Division Director of the International Sport Kickboxing Association. The ISKA is the sanctioning body of the sport, just like the NFL is for pro football. So, yes sir! I can help you with that heavy bag training.

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Ah, summer. That means no jam-packed backpacks in my house. No lunches stuffed into packs with all the other gear necessary for school. No bags sent home overflowing with folders and papers and all sorts of things, like library books, we try so hard not to lose. Nope, my kids' backpacks are sitting on a shelf in our laundry room in all of their sedentary glory. Before long, though -- about six weeks here in my city -- school will begin again, which means the backpacks will be out in full force.

Don't pack them until they're heavy, says the U.S. National Safety Council. Loaded backpacks can strain young backs and shoulders, causing pain and injury. Instead, check your child's bag each day and remove any items that aren't needed -- that would be rocks for my guys who like to collect and store them in hidden compartments. Also, make sure your kids use both straps to distribute the load evenly. Not sure you're doing everything the right way? Here are five warning signs your kids' packs are too heavy.

• A difference in posture when wearing the backpack.
• Significant difficulty in putting the backpack on or taking it off.
• Complaints of pain or discomfort when the backpack is on.
• Red marks on the skin from the backpack straps.
• Feelings of numbness or a tingling sensation, especially in the back or shoulders.

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Yes! Yes! Kickboxing in preschool! Last week, I had a little visit with my daughter's preschool class; I brought in a child-sized heavy bag and some (adult-size) gloves. Since I'm the Fitzness trainer Mommy, and kickboxing is one of the most fun things I do and teach ... we thought it would be great to share the fun with her buddies.

We spent the first few minutes chatting about being healthy. Choosing healthy foods and exercising was easy to discuss with these little ones. They were desperate to tell me about their favorite fruits and the fun things they like to do. In fact, I heard in great detail about each child's favorite bike, scooter or jump rope. This of course, was fun to for me. We talked sports too, and I addressed kickboxing as such.

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Do you have those friends who never gain a pound, despite the fact that they don't actually exercise and aren't careful about what they eat? Or are you one of those people? It certainly has a bit to do with genetics, but there could be another factor: NEAT.

NEAT is "non-exercise activity thermogenesis," which, according to diet-blog.com, is "the energy expended in everything we do that doesn't involve eating, sleeping, and sport-related activity." We've actually mentioned this before, but you might not be aware of just how big a difference NEAT can make in your weight.

In a study, sedentary subjects (some obese, some thin) were fitted with "magical underwear" that recorded every move they made. Everyone was fed 1000 calories more than their weight required for maintenance, and those who activated their NEAT didn't gain fat, but those who didn't gained 10 times more fat. Learn about activating your NEAT by clicking through the gallery.

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Curious to know how celebrities squeeze fitness into their daily lives? Want to know the secrets of the stars? Bi-weekly our That's Fit fitness expert Fitz sits down with the celebs we want to know more about, and digs out their great and not-so-great methods to staying healthy.

My guest this week is one of the most menacing creatures the Octagon has ever known. Andrei "The Pitbull" Arlovski is a contradiction as one of the Ultimate Fighting Champion's Title Holders, and the kind of guy anyone would die to call their friend. As generous as he is powerful......Andrei is someone I'm proud to introduce you to.

In fact, a couple of weeks ago I watched Andrei win a UFC match on television. Normally, he lives up to his nick name "The Pitbull," but on this night.....the story was only slightly different. He overwhelmed his opponent in a completely lopsided first round, and then chose not to go for the knock out in the second and third (UFC rounds last five minutes). This was very smart of Andrei, as it preserved his win and kept him far from risk. But.....the crowd wanted blood and gave a little "Boo." This is what I love about Andrei. He totally could have left his opponent unconscious if he would have chosen to, but since he didn't go for it....he took responsibility to the UFC fans. The man actually took the microphone post-win and apologized to the crowd! Have you ever heard of that? The guy is both and monster and a gentleman at the same time. A perfect combination.

Andrei is a former police officer and is now playing hero to his sport. Interviewing Andrei was a lot of fun for me. He speaks English extremely well, but I left his "accent" here in the interview. I think it adds to his charm. Enjoy!

Fitz: How did you get involved with Mixed Martial Arts and UFC?

Andrei: When I was a student in the Police Academy. It is a four year school like University here. Every student needs to learn a combat sport and I learned Sambo. I excelled at this and after the Academy I tested myself with cage fighting. I then moved to Chicago and had my first fight with the UFC.

Fitz: What are your workouts like when you don't have a fight pending?

Andrei: I work on my technique in Boxing, Jiu-Jitsu and freestyle wrestling. I also do my cardio to keep in shape.

Fitz: What are your workouts like when you do have a fight in the near future?

Andrei: My work out changes as it gets closer to the fight, and also changes depending on the opponent. I work out six days a week and 6-8 hours a day.

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Want to know what professional trainers like me wish for, for Christmas? Sing along!

On the first day of Christmas my true love gave to me, one water-based heavy bag.

On the second day of Christmas my true love gave to me, two boxing gloves.

On the third day of Christmas my true love gave to me, three ropes for jumping.

On the fourth day of Christmas my true love gave to me, four Body Buggs.

On the fifth day of Christmas my true love gave to me, five Versa Steps.

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Don't overpack for your holiday trips this year or you could be one of the 53,000 people who land in the emergency room each year with luggage-related injuries. That's right -- heavy luggage can do the body wrong, according to the U.S. Consumer Product Safety Commission.

How do you avoid a luggage injury? You can pack lighter, for one. And choose wheeled luggage appropriate for your height -- you should never need to bend down to pull your bag. You can use a backpack instead of a traditional carry-on. And be sure to lift luggage with both hands. Bend at the knees too, not at the waist.

Now don't give up entirely on heaving lifting -- just make it the right kind of lifting, do it correctly, and see how well our body responds. I'm talking weight training here. Click here to learn more.

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Are you surprised at all when I tell you American obesity rates are soaring? Probably not. I wasn't when my husband told me about this weighty article he'd read. It revealed that not one state showed a decline in obesity during the year 2006. Mississippi was the first state to crack the 30 percent barrier for obese adults. West Virginia and Alabama were just slightly behind. Colorado was the leanest state with a 17.6 percent rate. This year's report, looking at overweight children for the first time, has the District of Columbia topping the charts with heavy kids and Utah boasting the lowest rates for little ones.

Obesity is becoming an epidemic. And we need to treat it as an emergency. First step: determine where you stand. My hubby located this body mass index (BMI) calculator. I share it with you today so you can chart your own measurement. Just enter your height and weight and then calculate your BMI with one click of your mouse. If you come up with the number 30 or higher, you fit the definition of obese. If you find yourself in this predicament, you're in the right place. That's Fit offers an abundance of health and fitness tricks that can help you whittle away at your digits. If you are below the 30 mark, pat yourself on the back. And keep on truckin' in the direction of health, fitness, and wellness.

There's just one way to fix our nation's obesity problem -- plain old hard work. Each and every one of us must eat right, exercise right, and minimize our health risks. Only then can we watch our obesity statistics, like our BMIs, melt away to more perfect numbers.

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I must admit, I'm a bit of a cardio junky. I can spend hours on the treadmill or elliptical trainer, but that kind of exercise doesn't help me when I have to take take the groceries to my second-floor apartment, carry my friend's baby around or, heaven forbid, move some furniture. I don't want to be big and bulky, but I would like some functional strength.

This article from the people at About have suggestions on how to build functional strength. They recommend a few fun things like push-ups and lunges. Ok, by saying 'fun' I'm being sarcastic. But it's worth it to build a little bit of strength to help us out around the house, right?

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Over the past two decades of teaching fitness, the most common gripe I hear about ab work is that my students experience neck pain while doing crunches. It's true that our heads are quite heavy, and if the little boy in Jerry McGuire was right they weigh about eight pounds.Sounds heavy to me. It's not a problem for our necks to hold these big melons up-right as we stand or sit, but our neck endures an unusual stress while we're in the horizontal position. There are two solutions to get you the firm, ripped abs you're wishing for.

With proper hand support and practice, our necks can earn the strength they need for crunches. Or.....we can just avoid that issue completely with the plank. If you're not familiar with the plank it's a fairly simple exercise that puts a terrific amount of stress on your abs and low back (in a good way), and takes all the strain off your neck.

The simplest form is easy. Get down on the ground and elevate your body on your elbows, forearms and toes. Hover with your back and legs as straight as possible. It looks easy, but once you staring doing it......you'll find it to be extremely challenging. As a beginner, aim to hold this pose for 10 seconds. Repeat the plank at 10 seconds a few times. Every time you do this exercise I suggest you progress by tacking five seconds on to your holding time.

Kickboxing aerobics and tae-fitness classes have been the rage for the past few years. To some, they are a bit more fun and interesting than the traditional dance aerobics style group fitness classes. Instead of screaming "reach", instructors yell "punch" and the students go wild. Men are more inclined to venture into these fighting style classes as well. All good news.

As a competitive kickboxer of a little more than a decade I understand the lure. I was compelled toward the sport as a teen, and finally found a legitimate trainer at age 20. My first fight came soon after. I didn't invent kickboxing so I can truly brag about it. It works every muscle in your body from head to toe. It offers the benefits of intense cardiovascular training, builds strength, and increases flexibility. Not to mention it burns a bazillion calories. Oh! And so far, fighting is the most fun thing I've ever done in my life.

Back to those classes. I'm a fan of anything that makes people huff and puff, but if you're into that you may want to take it further. Find a class that utilizes equipment such as heavy bags, focus pads or kicking shields. Hitting the air is fun, but hitting an actual heavy bag is amazing. To me, hitting willing opponents........PRICELESS!

To find a martial arts school near you, visit http://www.martialsearch.com/usa.asp.

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