Based on personal history, I'd say I'm NOT good at triathlon. NOT NOT NOT swimming, NOT running, and NOT cycling. I enjoy them, but I'm not particularly good at any of them. I'm definitely good at powerlifting (but I don't like the long hours of gym training), and I'm very good at some types of equestrian sports (although I haven't spent time on it in years).
But this online survey says I might be good at speed skating (never tried it), and road cycling (hmmmm....), but not so good at snowboarding (it hadn't caught on the last time I went skiing years ago), surfing (never tried it), squash (hopeless - no hand-eye coordination), and table tennis (more hopelessness).
What does it say for you?