As Britney Spears spent her 28th birthday with her family on December 2nd, 2009 it definitely marks the latest in an ever evolving persona for the pop diva. From her early beginnings as a bubble gum chewing teen, to then topping the music charts and being nearly every male's fantasy, to then being a tabloid staple for the odd and tragic, to now looking to make a comeback. As her personal and professional life has played out before the public eyes so too has her body. She's be scrutinized to no end every time she gains weight and then given just as much attention when she sheds it and gets back in shape.

It seems that Britney Spears is forever being dogged by paparazzi to catch a snap of her in her current form, be it in a bikini, at the gym, or eating a back of Cheetos. While she has the tendency to yo-yo between rock solid abs and a belly pouch she does have a way of snapping back into shape relatively fast when she puts her mind to it. With so many people struggling to reach their own ideal weight or fitness level it is worth pointing out that while it is possible to fluctuate like crazy and then get a killer body with an suddenly intense workout routine and abrupt diet overhaul, the best way is to rather stay consistent.

Instead of letting yourself get to the point that you are so unhappy with your shape you can't stand it, stay motivated to never fall off of the wagon by remembering how good you feel about yourself when you are active and working out. Then if you do miss a few days or have a lapse instead of letting that snowball into months of missed workouts get right back to it and you will get into shape much faster. The same goes for your diet; it's okay to have a few cheats as long as you eat reasonably healthy for the most part. But if your diet consists of junk food alone, you'll definitely feel the bloat, gain those extra pounds, and be left feeling sluggish and unmotivated to hit the gym.

So even if Britney Spears has again wowed up with her latest showing of her ability to pull herself out of fitness AWOL and kick her bag of Doritos and Blizzard treats to the curb and transform her body yet again to look great on her tour, it's not healthy to swing between two opposite ends of the spectrum.