I have been working with a personal trainer for 3 days a week, for a month now. When I started working out, I was 6ft and 230 lbs. I have maintained that weight for about a year. But every time I check the scale since working out, I go up. I am now 237 lbs a month later. My arms and legs are definitely strong, and I go to the gym the days I don't work out with my trainer. That being said, I probably have worked out more in the past month, then I have in 4 years. So why am I gaining weight? I am not giving up, because I know the only answer is to keep working out, but I don't know what is wrong.