<<bowling is a great game
but i don't consider it a sport >>
What constitutes being a sport? Is running necessary? Jumping?
Do you consider baseball a sport? Look at some of the players. Big guts, couldn't run a mile if they had to, slower than the earth, but they're strong and have great hand/eye coordination so they can hit.
There are tougher sports than bowling, but if bowling was easy, there'd be no pro tour. Try bowling 60 games in 4 days under pressure. You have to have strong legs, arm, back, and great hand/eye coordination.
Same as lots of sports.