25 is considered good - so 26 is just slightly higher than average. You're fine.
 
 However, I think BMI is a big steaming pile of misdirection. It doesn't take into account your build etc. Even when I was in the Army and extremely fit my BMI was always in the overweight range, and I wasn't overweight. I've got a big build.
 
 After I bulked up to play rugby the BMI classified me as obese! I'd like to see an obese person play 80 minutes of rugby at inside centre!