1, organizer ( k8 G* y( ^; o2, commitment 4 \0 {: Q. K X" R! n3, every paddler is different, some are recreational, some are serious competitors + H9 h$ Y/ S- e' }; z" h0 W c7 a, v* D4, cost 5 U9 c2 O. E, j5, fitness level 4 x! g8 S$ B' D' L2 K+ g6, whatever other factors