Isaiah Kacyvenski still remembers having pre-game butterflies.
Not from seven seasons in the NFL, six of which were spent with the Seattle Seahawks. Not from serving as a game-day captain on the Seahawks squad that played in the franchise's first Super Bowl in 2006.
Some of the earliest memories of pre-game jitters came from flag football. It was a big deal in Endicott, New York, where the pro football player turned Harvard standout, turned entrepreneur first grew fond of the sport.
There was a draft, scores and records posted after games, a league commissioner, postseason tournament and a Super Bowl with a cash prize.