One of the biggest differences between open water and pool swimming is sighting. Sighting is a skill that should be practiced in the pool just as much as in open water because it requires precise head movement in order to maintain your speed and efficiency.
“There’s a lot more head movement in open water,” Puskovitch says.
“In the pool, you’re not picking your head up, you’re not looking around, you’re not trying to get your bearings by looking for landmarks or buoys. Your head is down and then to the side, you're swiveling laterally. Whereas in open water, you’re getting that vertical swivel as well.”
“When you factor in additional movement like that, you create opportunities to break your body line and create a lot of additional water resistance, which will slow you down, drop your lower body, and cause you to swim more vertically, which is not as efficient as when you're more horizontal.”
Puskovitch drills head position in the pool, both the optimal positions while swimming and the vertical movement to sight. To practice, he uses a snorkel so he can completely focus on his body position.
“I mainly use the snorkel to practice keeping my head straight, so that when it's time for me to sight, when it's time for me to pick my head up in an open water race, it’s second nature for me not to have my neck drift off to the side and create additional water resistance in the neck and the upper chest area.”
“The goal isn't to push pace or reach really high intensities. The main focus is practicing proper head positioning and neck alignment. I’ll also pick my eyes up over the water while I'm wearing the snorkel to practice the sighting motion when we're doing a lot of drill work.”