CHARLOTTE, NC- For CrossFit newbies, trainers at CrossFit Dilworth are focusing on the fundamentals.

"We want to see good form and technique and we want to see that consistently. So the intensity is not even a factor,” said Jimmy Pitsiniagas, CrossFit Dilworth owner and coach.

The fundamentals class is a way to prevent major injuries doctors are treating across our area.

"As they get the movement and they can show proficiency with those movements, then we'll start adding in weights and factoring in the clock more," said Pitsiniagas.

Trainers and doctors say one of the biggest problems is rookies going from zero to 60 too fast.

"If you've been sedentary most of the last year, if you don't exercise or you're overweight... you may not be able to take some of those lunges and squats. You're knees may not be able to handle that," said Eric Warren, Waxhaw Sports Medicine Center Physician.

Warren says it's all about the want to drop pounds quickly - not safely.

"I'll see eight to 10 more patients a week often from high intensity workout programs where they've injured themselves. It's just too much, too soon," said Warren.

In insanity, CrossFit.. And P90x, the most common injuries are shoulder, back and knee injuries. The most concerning is muscle failure.

"The muscle itself starts to break down and the bi-products of those breakdowns are horrific to the body. They can cause anything from muscle pain to nausea and in some cases, kidney failure," said Grady Hardeman, Carolinas Medical Center Athletic Trainer.

 Hardeman says to make sure you find certified trainers and if something does happen... "Listen to your body and address injuries early," said Hardeman.