Not an athlete at all in High School, cause I was a chess playing computer nerd. Still inactive all through college and the first few years of working (computer programming).
As I turned 26, I decided to make an effort and gain some weight so I could cast a shadow on sunny days. Yea, I was seriously underweight.
I joined a gym and hired a personal trainer (this is before training became a profit line item for gyms). I found one of the big, beefy guys who worked out all the time and paid him $120 per month for 6 months to workout together.
I gained nearly 30 lbs in a year. I hit a more reasonable weight of 155lbs. But, I had some belly fat, so I started running and biking. I bought a mountain bike and rode it all the time. I started running and did a few 10Ks, trying to beat my goal of 6 minute miles.
I developed a passion for sand court volleyball and did all kinds of weight training and conditioning to improve my skills. So, I became a gym rat.
And then I met my wife. I introduced her to mountain biking and she introduced me to skiing. So, we bike together all the time and ski together all winter (ski season is almost here!).
So, when we are not biking or skiing, we are in the gym improving our conditioning for biking and skiing.
And from time to time, I hurt my knee, so I have to switch to swimming. When swimming, I work my way up to 3000 yd session with a mixture of long course and short course (sprints) workouts.
Not a competitive athlete, but I work very hard to maintain functional conditioning for my activities.
Almost 56 right now. I gave up the volleyball and running as the knees cannot handle it. I will continue mountain biking until I get very hurt I guess( I had a significant head over handlebars event last summer and trashed my tricep). I will keep skiing as long my troublesome knee will let me. The last 2 seasons were great, so I got a season pass at the really hard local mountain (Snowbird). It is early in the leg conditioning phase and my troublesome knee is complaining more that it should).