Swimming Guide: While flip turns are not necessary for swimmers, they do make swimming faster and often easier for most swimmers. An alternative to flip turns is an open turn. What do you look at as you do the flip turn?
If you are not already doing so, try looking at your knees as you flip. Your knees will not move much relative to the rest of your body (since they are part of you!) and that may help reduce the "I am tumbling" message to your brain. That reduction may in turn reduce or eliminate the nausea you are feeling while you swim and do the flip turn.
Try it and let me know if it helps.
Swim On!
