Rafael Cabrero, a customer service representative for Verizon Wireless in Laurel, lost 219 pounds in 11 months using the company gym and the services of its three trainers, at a cost — to him — of $15 a month. As the weight came off, Cabrero’s blood pressure fell and his aching back and knees improved. Cabrero, 37, has little doubt about the value of employer-provided fitness programs.