Open Water Marathon Swim Training Plan. This plan assumes that athlete is an experienced open water swimmer and has been swimming 2-3 time per week with an average of 2 to 3k per swim session. The plan is based on pace and distance for swimming and time for the strength and conditioning sessions This plan also assumes that the athlete has their own Strength and Conditioning training details and also may attend a weekly coached swim squad. If detailed Gym and Swim Squad training sessions are ...