If you have strong legs and strong arms but your core is weak, it's as if you have two cinder blocks with a balloon between them.

Your fitness routine is in full swing two months into the year: You're eating right and you're exercising, but you're not yet seeing the results you want.

In this era of CrossFitters, SoulCyclists and yogis, as well as barre, Zumba and Insanity devotees, people often focus on one - and only one - fitness format.

We asked some fitness and nutrition experts to identify some common risky resolutions and offer healthy alternatives for the coming year.

They're here: the holidays with their cheer and charm on the one hand and their chaos and crazy on the other.

CrossFit, Insanity, Pure Core. Every year, new hard-core players and routines make a splash on the fitness stage. But truthfully, they stick with only about 20 percent of the population - those who are already fitness converts.

Fitness instructors, you may have noticed, are always nattering on about breathing: "Breathe through the nose," "Control the breath," "Push up on the exhale." There's a reason for that.