For many of us, getting fit is an ever-present entry on our to-do list. Not so for Mike McAdam. Since April 2012, McAdam, 41, a recreation coordinator at Goebel Adult Community Center, has lost an incredible 225 pounds. “Last year at this time I would dread walking to the front desk to greet visitors,” he told me recently. “My knees hurt. I was tired and winded, and finally said to myself, enough is enough.” McAdam joined a gym and began working out but then tore his meniscus, a knee injury, which delayed his efforts to get fit. After the injury was repaired, he began walking instead but couldn’t exercise long enough to lose weight. His doctor recommended weight-loss surgery, and McAdam underwent the procedure to insert a gastric sleeve in his stomach. “The surgery is just a tool,” McAdam said. “It forces you to change your eating habits, but in order to truly lose weight you must also increase your physical activity.” Not long after his operation, McAdam began a walking...