Concentrating on the core – Alanna Gerwitz-Stern gained more than 100 pounds during her first pregnancy, reaching 230 pounds.
Concentrating on the core – After her son, Jacob, was born in December 2009, Stern struggled to lose the baby weight.
Concentrating on the core – In the six months after Jacob, now 4, was born, Stern was only able to work off 10 pounds through cardio and weightlifting.
Concentrating on the core – Stern was embarrassed to go to the gym and only wore sweatpants. "I felt like there was a better me," she said, determined to lose the weight rather than just accept her fate.
Concentrating on the core – By attending plyometric and core classes at the Core Concepts gym in Toronto, Stern lost 110 pounds in just eight months.
Concentrating on the core – Core Concepts owner Joshua Lipsey emphasizes exercising your core -- made up of your abs, obliques, back and glutes -- because it is often a problem area.
Concentrating on the core – After reaching her goal weight of 120 pounds, Stern became pregnant with twins. This time, however, she continued to work out until Lily and Levi, now 18 months old, were born.
Concentrating on the core – Now back at work and taking care of three kids, Stern has been using Lipsey's Gym Tuck mobile app to stay fit and target her problem areas.