Here are some excellent tips for swimming in rough/choppy water, which is pretty much any swim in triathlon when everyone is splashing all around you. If you have your first triathlon coming up, practice swimming in open water before the race! You will be surprised at how different the experience is from the pool. In my first open water tri, I freaked out and ended up on a surfboard despite having been swimming in the pool for months.
Also notice that Coach Leslie is wearing a cozy jacket on the beach, yet she chooses only a swimsuit for the water. Don’t be fooled–that water is cold. Unless you’re acclimated, don’t get hypothermia–wear a wetsuit!