DALLAS - Trevor Marum is the owner and personal trainer at VERT Fitness in Dallas. He says he gets clients all the time who've made painful mistakes working out.

"The beginning of the year, end of January, early February, is my largest time when I see people coming in with these types of injuries," Marum said.

His wife, Virginia, learned the hard way shortly before they met.

"I actually ended up tearing my calf muscle quite severely, was actually on crutches for a while. That injury led to me basically being out of any sort of exercise, spin classes, yoga whatever for almost a year and a half," Virginia Marum said.

For many newly inspired gym-goers, tread mills seem to be a problem. People fall off and trip over them. User error may be to blame for 575 hospital trips in 2009, according to data from the Consumer Products Safety Commission.

Last year across the country, there were more than 1,500 reports of exercisers landing in emergency rooms after run-ins with their equipment.

"We see a lot of people from running injuries, biking injuries, a lot of back pain from lifting heavy objects and stuff like that, it's very common," said Dr. Sam Crowely, who works in the ER at Texas Health Presbyterian in Dallas.

Dr. Crowley says over-use and misuse of equipment can lead to ankle sprains or knee injuries.

"Start slow, know your limits and realize that if you were able to do it 5 years ago doesn't mean you can do it now," he said.

Back at VERT, Marum says safety first. Remember quality, not quantity. If you can't afford a personal trainer, don't sweat it, many gyms offer free assessments so you can learn basic tips to fix your routine.