What's your biggest fitness achievement to date?

What's your biggest ever fitness achievement to date, and how did you do it? That's the question I'd love to hear your answers to.......

For me it was getting up to 185 lbs in weight, more muscular (12% body fat) last year. i'm a 42 year old male, 6'1" (185cm) tall. Right now I'm around 13.5% body fat, and 182lbs . Most people's goal is to lose weight, mine is always to gain weight, as long as it's lean muscular weight (with the proviso that I don't exceed 15% body fat maximum).

I achieved this through 3 times a week weights (1 hour sessions), and tennis once a week (90 mins), and 2 cardio sessions (20 mins each), and a couple of core workouts (20 mins each).

So what's your biggest achievement and how did you get there?