Overstruning or Overstraining: How To spell?

The word Overstruning is misspelled against Overstraining, which is present continuous of "Overstrain"

Word contains consecutive vowels 'AI' in between alphabets overstr & ning is misspelled as 'U'
Wrong Spelling:  overstr-u-ning 
Correct Spelling:  overstr-ai-ning 
Check more misspelled words of Overstraining to spell it correct.

You might be interested to know

Pharisusm or Pharisaism?

Prusing or Praising?

Rul or Rail?