That's hard to believe when you see her teach a body pump class that would challenge the fittest of military men.
"I weighed 205 pounds and at 5 (foot) 5 (inches) I was obese, I knew I had to make a lifestyle change, a big one," Martin said. "It's true what they say you are what you eat and my diet was filled with processed food."
The turning point for Martin was when she was diagnosed with plantar fasciitis. According to MayoClinic.com, plantar fascitis is a painful inflammation that occurs on the sole of the feet. It is common in runners, but also affects people who are overweight.
"I would wake up in the morning in extreme pain. It would take my feet at least an hour to loosen up and not cause me pain." Martin, 30, said.
"I thought, 'What's next? Insulin?' It was time to clean up my eating habits I was 24 at that time and I didn't want to succumb to other diseases such as diabetes at such a young age," she said.
Then after reading a book by Dr. Barry Sears called "The Zone," Martin said she started to eat healthier.
"It took almost two years to clean up my eating habits, but it is the foundation of a healthy lifestyle," she said.
Martin said at first she wasn't able to afford a gym membership, so she started exercising at home.
"My husband was 303 pounds at his heaviest and we both knew that we only have one life to live, so we need to make changes," she said.
Their exercise routine included push-ups, pull-ups and sit-ups.
"I remember not being able to do even one pull up it was so hard," she said.
But in 2009, she sat on the sidelines during Freedom Runs marathon in Shepherdstown, W.Va.
"That day changed my life as I saw people of all shapes and sizes participating. I thought if they can do it, so can I," said Martin.
Martin signed up for her first race in April 2010, the 8-kilometer Wild Woman Race in Frederick, Md.
"After that 8K race, I was hooked and wanted more," she said.
In October 2010, Martin signed up for her first half marathon in Baltimore.
"I finished the Baltimore half marathon in 2 hours and 14 minutes. In 2011, I won a 5K and a 10K, and in 2012 I won two 5K races," she said.
Martin said her weight loss didn't happen over night.