Yes, it's hard work to do & not everybody can do it, there's A LOT of flips & stuff involved & people get hurt for life sometimes doing gymnastics...
AND, there ARE gymnastics competitions ALL THE TIME, INCLUDING the one in the Olympics every four years...sports don't ALWAYS involve a ball...why is there gymnastics, taekwondo, skiing, bobsled, ice skating, etc. in the Olympics if they're NOT sports?