September 22, 2026
Swim Ontario Warm-up Rules Updates & LCM Chase Requirements
Competition warm-ups are recognized as one of the highest-risk periods of a swimming competition due to the number of athletes in the water and on deck, the variety of activities occurring simultaneously, and the limited space available.
During warm-up periods, athletes may be swimming at varying speeds, practicing turns, or performing stroke-specific drills while others are entering, exiting, or moving around the pool deck.
These conditions increase the potential for collisions and accidents both in and out of the water.
Accordingly, coaches, swimmers, and officials share responsibility for maintaining a safe warm-up environment by complying with these procedures and exercising awareness, courtesy, and good judgment at all times. Coaches are encouraged to support Safety Marshals in promoting a safe environment.
One Lead Safety Marshal is required for the full warm-up period before a single- or double-ended session when either of the following applies:
The Lead Safety Marshal must:
If the Session Referee is unable to brief the second group of Safety Marshals for a split warm-up, the Lead Safety Marshal shall ensure they are properly briefed.
Warm-up is the highest-risk window of a session → and the point when senior officials are pulled off deck for briefings
The L2 or higher Lead Safety Marshal requirement closes that gap → ensuring certified, experienced oversight stays on deck while briefings run
Double-ended Long Course Metre (LCM) chase starts are the second-highest safety risk at competition, after warm-up. When two heats share the pool, swimmers finishing and swimmers racing are in the water at the same time, often at the same wall. That leaves little room for error in timing, communication or supervision.
To protect swimmer safety and the fairness of competition, chase starts are permitted only when every parameter below is followed. That covers timing intervals, heat limits, clear signalling between ends, and experienced officials in key positions.
Host clubs, the Competition Coordinator and session referees share responsibility for planning, staffing and running chase starts to these standards. Where any requirement can't be met, events must be started from one end only.
Double-ended Long Course Meter (LCM) chase starts are permitted provided all parameters under which LCM chase starts can be utilized are followed:
All LCM Chase Starts competition must provide a session report (following the sanction requirement timing intervals) and senior officials grid to Swim Ontario at minimum 5 days prior to the start of the competition.