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Workout routines are going to the extreme. Running through mud and fighting in cages are just some of the latest examples. But one wrong move could put you on the sidelines for good.

These women's workouts are no walk in the park. A dislocated jaw, broken ribs and 20 cases of cauliflower ear hasn't stopped Caroline Portugal from cage fighting.

Take little diabetes syringes to remove the blood from the broken capillaries, Portugal said. It definitely kicks your butt. It is the ultimate cardiovascular workout.

Then there's Krizia Carr, who prefers aerial exercises.

Strength equals confidence, said Carr. If you don't have that power, you doubt yourself, you think, oh my gosh, I don't want to let go. Whatever, you don't want to have that in the back of your mind because then you could make a fatal mistake.

Carr started flying on the trapeze when she was five years old.

Jodi Hebert also runs through mud and scales walls to get her kicks.

You get up it, it's like, 'wow' I did that, and it's a 10 foot wall, said Herbert.

Exercise physiologist Jeanmarie Scordino says people who don't train properly for extreme workouts can end up with knee, lower back, and shoulder problems.

Some of the stuff that's done is so extreme, and the body is not yet prepared for it, said Scordino. There s unfortunately also a lot of heart attacks that occur with a lot of these races.

There's also a point of diminishing returns. Benefits drop off the longer and harder you exercise, but that doesn't lessen the appeal for some athletes.

In the 1970s running a marathon used to be considered extreme; now it's adventure races that have participants doing everything from crawling through live electrical wires to jumping over fire pits. Of course TV shows have helped fuel the popularity of extreme sports.

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