Len-5: Practiced the backstroke but I still get water in nose. I could inhale while stroking but the pain is felt after the lap (half of length). It may be easier to gauge straightness by looking at trees at the side - lengthwise. Mang Ruben saw me do the backstroke and then he proceeded to do 1 length of fly - 2 kicks per stroke/ breath. He also did short and slow breaststroke which didn't look strong. Dante and another pool cleaner were scouring/ removing hard scum at pool sides so there was some scum floating. Yuck! I didn't resume after the break.
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