I'm ambidextrous, but left-hand dominant in general. For anything that involves fine motor skills and detail, I'm usually left-handed. For things that involve large muscle groups, I'm usually right-handed. I eat left-handed and play tennis right-handed (one-handed backhand). I pitched right-handed but could pitch left-handed - it was more accurate but a lot slower. Whenever I return to an activity after a long absence, I have to work out whether I'm right-handed or left-handed at it. Often I use my right hand simply because I'm following directions or a pattern written for a righty.
My brothers and I are all left-handed, but I am the only one of us who has become ambidextrous. I'm sure it's because I'm the oldest, and I grew up playing a lot of sports. I didn't have my own equipment yet, so I learned to play using the equipment (such as fielding gloves) that belonged to neighborhood kids and emulating their technique. I became right-footed when I started playing soccer. By the time my brothers were old enough to play sports, we had all sorts of left-handed equipment at home. By the way, both of my parents are right-handed.
When my youngest brother started to show left-hand dominance, my parents wondered if they were somehow doing something to make us left-handed. They experimented by trying to put things in his right hand, but he would have none of it - down to the floor everything went! I have an aunt and uncle who are both left-handed, and all three of their kids are right-handed.
After playing a lot of tennis for the last 20-odd years (after years of pitching and throwing), I'm afraid I've torn up my shoulder. I'm starting to think about "waking up" those left-handed arm and shoulder muscles to see what I can get out of them! What I wouldn't give to have been left-handed in tennis all along... All other things being equal, I would have won a lot more matches!
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